The cell that receives an action, such as a click, calculation, or paste is the ________ cell

In a recursive module, the part of the problem that can be solved without recursion is known as the __________ case.

Fill in the blank(s) with the appropriate word(s).

Parentheses that are added to an expression simply to make it easier to read are known as _____________ parentheses.

a) necessary b) redundant c) embedded d) nested