What do we call the amount of space between the top, bottom, right, and/or left sides of text and its cell borders?

In a(n) ________ relationship, the common field used to join two tables must have a unique matching record in the other table

A) exclusive B) sole C) singular D) one-to-one

Describe the trial-and-error method of troubleshooting and when it should and shouldn't be used.

What will be an ideal response?