What methods from the following make sense for the ADT of a sorted list?

Question

What methods from the following make sense for the ADT of a sorted list?
Note: This is a multiple-answer question.

o removeFirst()

o first()

o add(object)

o size()

o last()

o isEmpty()

o removeLast()

o remove(object)
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I want to say the answer is all the above except add(object) and remove(object) but i'm unsure.

Answer 1

This is all the question is asking of on the review which is to detemrine which method makes the most logical sence for ADT of a sorted list.

Answer 2

minimum is:
size()
add(object)
remove(object)

+ isEmpty() can be usefull

other is necessary for linked list as internal methods,
but, this is abstract list
and we don't know how it is implemented