Question: What is used to discover the right exposure parameters?
Answer: The equation may be expressed as ratios, or, by taking the logarithm (base 2) of both sides, by addition, using the APEX system, in which every increment of 1 is a doubling of exposure; this increment is commonly known as a "stop".
A single-select problem: Is the question answered in a satisfactory fashion?

Available choices:
a). yes.
b). no.
b).