Which data structure is used to check for balanced symbols?

Given a list, animal List, that contains the objects: cat, dog, tiger, lion; the function last item from list would return which object?

a. cat b. dog c. tiger d. lion e. None of these

In Microsoft Excel 2016, charts are used to:?

A. ?represent data in rows and columns. B. ?illustrate numbers. C. ?emphasize geographical features in maps. D. ?change a page's orientation.