An array is a random access data structure; a stack is not. a. true b. false

In a linked list implementation of a stack, the reference variable to the top of the stack is set to NULL. a. true b. false What is the time-complexity of the copy constructor? a. O(1) b. O(n) c. O(log n) d. O(n²) The elements at the top of the stack have been in the stack the longest. a. true b. false Adding an element to a full stack and removing an element from an empty stack generate errors or exceptions called stack overflow exception and stack underflow exception. a. true b. false