In a linked chain implementation of a stack adt the performance of popping am emtry from the stack is
a. o(n2)
b. o(1)
c. o(2)
d. o(n)

B.O(1)

Explanation:

When we are implementing ADT stack using linked chain we can pop an entry from the stack having O(1) time complexity because in linked chain we have the head or top pointer in linked chain only.Popping and pushing in stack happens on only one end that is top.So we have move to move top in linked chain to the next and delete prev node.

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