A command that switches between an on and off state each time it is clicked is called a ________

Which of the following functions calculates the total number of years between two dates, including part of a year?

A) YEARPART B) YEAR C) YEARTOTAL D) YEARFRAC

Java has existing collections that implements the stack data type. Why is it important to know how to implement our own stack data types?

What will be an ideal response?