In relational databases, there is a concept known as ________ that ensures that data cannot be entered into a related table unless it first exists in a primary table

A validation rule is a property that can be assigned to fields to ensure the correct data is being entered into the field

Indicate whether the statement is true or false

In ____ typefaces there is a delicate, horizontal line that finishes off the main strokes of each character.

A. serif B. sans-serif C. mono D. sans-mono