Consider a stack that is implemented using a built$-$in Python list, where the top of the stack is the start of the list $($i$.$e$.$ index $0),$ and the bottom of the stack is the end of the list. Which statement is True?

Question $4$Select one:

push$()$ is O$(1),$ pop$()$is O$($n$)$

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push$()$ is O$($n$),$ pop$()$is O$(1)$

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push$()$ is O$(1),$ pop$()$ is O$(1)$

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push$()$ is O$($n$),$ pop$()$is O$($n$)$