Which of the following is required to pass an argument by reference?Select one:a.swap(2,3); Pass the values as literalsb.swap(&x, &y); Send the address of the variable as an argumentc.&a, &b = swap(x,y); It must be returned to a variable as an addressd.void swap(int &x, int &y); Receive the variables in the parameter as an address

Which of the following is required to pass an argument by reference?Select one:a.swap(2,3); Pass the values as literalsb.swap(&x, &y); Send the address of the variable as an argumentc.&a, &b = swap(x,y); It must be returned to a variable as an addressd.void swap(int &x, int &y); Receive the variables in the parameter as an address

Give the values that are changed after the call to the swap function if the parameter passingmechanism used is call-by-reference.swap ( i , a [ i ] )Assume the initial value of i. Make any other necessary assumptions. Justify your answerby showing the values at each step of the swap function.

Consider the following C functionvoid swap (int a, int b){    int temp;    temp = a;     a = b;     b = temp;}.In order to exchange the values of two variables x and y.a.Call swap (x, y)b.Call swap (&x, &y)c.swap(x,y) cannot be used as it does not return any valued.swap(x,y) cannot be used as the parameters are passed by value

Which of the following method duplicates the address of an argument into the formal parameter?a.Call by Valueb.Call by referencec.Return Typed.Parameter

What is the purpose of the swap function in this program?*1 pointA. To swap the positions of two adjacent elements in the array.B. To swap the values of two variables in the main function.C. To swap the elements at the beginning and end of the array.D. To swap the positions of every two elements in the array.After the fourth pass, what is the array state?*1 pointA. {1, 2, 4, 3, 5, 6, 7, 8, 9, 10}B. {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}C. {2, 1, 4, 5, 7, 3, 8, 6, 9, 10}D. {10, 9, 8, 7, 6, 5, 4, 3, 2, 1}