You Are Concerned That a Person Presenting with Fatigue, Altered

You are concerned that a person presenting with fatigue, altered menses, and weight changes may have a thyroid disorder. To rule in/rule out thyroid dysfunction, the initial diagnostic test(s) that you should order is/are:

A) Free T₄ and serum antithyroid antibodies
B) Thyroid ultrasound
C) Highly sensitive thyroid-stimulating hormone (TSH)
D) Free T₃ and thyroid scintigraphy