A(n) ____ is a value used to guard the end of the series of values in an input loop.

Which country contributed the least amount of spam for the week ending July 24, 2011?

a. United Kingdom b. Poland c. Colombia d. Thailand

After a proposed change is accepted or rejected, which of the following if removed from the cell?

A) The changes B) The triangle C) The tracking notation D) The cell's value