which of the following are true of stacks? (select all that apply.) select all correct options stacks are accessed using last-in, first-out order. a javascript array may be used as a stack if necessary. retrieving the topmost (last inserted) value from a stack can be done in constant time (at best). adding an item to a stack can be done in linear time (at best). retrieving any item (other than the topmost one) from a stack can be done in linear time (at best).