To screen a client for pheochromocytoma, a nurse schedules a vanillylmandelic acid test. When teaching the client about this test, which of the following instructions should the nurse include?

a."Start fasting at midnight prior to the day of the test."
b."Begin the 24-hour urine collection with the first morning urination."
c."Take low-dose aspirin for pain during the testing period
d. "Restrict coffee intake 2 to 3 days prior to the test."