Match the type of constraint with an example of it

	Completions by a QB, which must be less than the pass attempts by a QB
	A programmatic mask that converts someone's phone number entry to a string of digits
	The nation of an Olympic medalist in Pyeongchang, which must come from an evolving list of nations stored in another table

A.	Foreign key
B.	Table-level
C.	Field-level
D.	Front-end solution