A$)$ Question $1$:

What is a stack:

a$.$ A linear data structure with a First In First Out $($FIFO$)$ order.

b$.$ A linear data structure with a Last In First Out $($LIFO$)$ order.

c$.$ A non$-$linear data structure.

d$.$ A data structure that allows random access to elements.

B$)$Question $2$:True or False:

In a stack, the operation to add an element is called "pop."

C$)$Question $4$:

Write push method for stacks.