6.We use an array A of 10 elements to implement the stack. Which one is true for declaring the array in C? (A) integer A:10； (B) integer A[0,9]； (C)integer A[1, 10]； (D) integer A[10].

複選題10. We use the linked-based implementation as defined above for the stack. After executing the 10 operations, which of the following are true? (A) first is not O； (B) first contains the address where 5 is stored； (C)Alfirst]=4； (D) A -＞ first = 4.