Question: When a stack is used to keep track of how many parentheses in an expression are still open and in which order they should be

When a stack is used to keep track of how many parentheses in an expression are still open and in which order they should be closed, what must be true at the end of the expression for the parentheses to be balanced?
Group of answer choices
The stack must have an odd number of elements.
The stack must not be empty.
The stack must have an even number of elements.
The stack must be empty.

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