1. Which is the only function all C programs must contain? A. start() B. system() C. main() D. printf() 2. Which of the following is not a correct variable type? A. float B. real C. int D. char 3. In C, if you pass an array as an argument to a function, what actually gets passed? A. Value of elements in array B. First element of the array C. Base address of the array D. Address of the last element of array 4. The value obtained in the function is given back to main by using. A. return B. static C. new D. volatile 5. Array with 'n' numbers of element will always have the last index equal to A. n B. n+n C. n-1 D.h+l keyword?