What is the first argument of the strcat() function in C programming?

Understanding strcat() functionWrite the correct output for the below C code?#include <stdio.h>#include <string.h>void main(void) { char str1[] = "Godavari"; char str2[20]; char str3[] = "River"; int i; i = strcmp(strcat(str3, strcpy(str2, str1)), "RiverGodavari"); printf("%d\n", i);}Output:

What is the output of the following code ?#include <stdio.h>#include <string.h>int main() {    char str1[] = "Hello";    char str2[] = "World";    char str3[20];    strcpy(str3, strrev(strcat(str1, str2)));    printf("%s", str3);    return 0;}

What is the action of strcat() function?*1 pointcompare two stringsconcatenate two stringsfind the length of the stringcopies one string to another

Study the function:void t(char* S) {  for (int i=0; i<strlen(S); i++) S[i] = S[i]+1;}This function is called as:char S[10]= “ABCD”;printf(“%s”, t(S));What is the output?a.Abcdb.Compile-time error.c.ABCDd.BCDE

Explain strcmp() function in detail. Write a C program that demonstrate the use of printf() and scanf() function.Explain declaring and initialization of an array. Explain static and register variables. Write a C program to find the smallest number stored in an array.