How Is a Glucose Challenge Test Different from a Glucose

How is a glucose challenge test different from a glucose tolerance test?

A) The two tests are the same; they just have different names when used for pregnant women.
B) The glucose tolerance test requires the patient to fast before the test begins, and the glucose challenge test does not.
C) The glucose challenge test is longer than the glucose tolerance test.
D) The glucose challenge test requires the patient to fast before the test begins, and the glucose tolerance test does not.