variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). Rules for R variables are:A variable name must start with a letter and can be a combination of letters, digits, period(.)and underscore(_). If it starts with period(.), it cannot be followed by a digit.A variable name cannot start with a number or underscore (_)Variable names are case-sensitive

Which of the following variable names are INVALID in R? 1_variable variable_1 _variable variable@

Which of the following are requirements for variable names?

Which of the following statements about variable names is true?Select one:a.A valid variable name can be up to 40 characters in length.b.A valid variable name can start with a number and end with a number.c.A valid variable name may consist of letters, digits, and the underscore (_) character.d.A valid variable name may contain uppercase letters, which are no different than lowercase letters.

A variable is a name given to a memory location to store some value. Since the memory location can store different values during execution of a program, the name used to refer to it, is called a variable.Since variables are a part of identifiers, they follow the same naming conventions. Like identifiers, a valid variable name can start with an alphabet or an underscore ( _ ) and later have a combination of one or more letters, digits and underscores.A few examples of valid variable names are : sum,total,average_marks, etc.When creating a variable, we should mention the type of data (for example, integer or character) that it would store. This is called the data type of that variable.In a C program, variables should be declared before their usage.The format for declaring a variable is data_type variable_name;.For example:int count; // int is the data type and count is the variable nameThe above declaration can also be combined with initialisation. In such a case, the format for declaring a variable is data_type variable_name = constant_value;.We shall learn more about data types and constants in the later sections.Given below is an example of declaring and initialising a variable in the same line:int count = 9; // Here the variable count is being initialised to a constant value 9 Invalid#include <stdio.h>void main() { printf("age : %d", age); int age = 34; // this is the declaration statement} Valid#include <stdio.h>void main() { int age = 34; printf("age : %d", age);}Select the correct statements from the given statements.Variable is an identifier which is used to store data.The value stored in a variable is fixed. It cannot be changed once it is initialised to a value.Variable is the name given to a memory location.The type of data stored in a variable is specified by its data types.

Which of the following is wrong in reference to naming of variable? Mark(1 Marks)(Choose one option)Keywords are not allowed for variable namesVariable names can start from numberSpaces are not allowed for variable namesSpecial symbols are not allowed