During the RRA, how should you hold the light sensor when taking the majority of light measurements?

A.
Horizontally, so it gets the direct lighting from ceiling light fixtures.

B.
Vertically, toward the displays to measure the light they put off.

C.
Horizontally, toward and untreated windows to measure light coming in.

D.
Vertically, so it is reading light as if it were hitting the participant’s face.