In SDT We Represent Signal and Noise as a Pair

Multiple Choice

In SDT we represent signal and noise as a pair of distributions. Which of the following describes conservative responding?

A) X_C is placed to the left of where the distributions meet
B) the observer says "no" (signal absent) much more often than she says "yes" (signal present)
C) the observer says "yes" (signal present) much more often than he says "no" (signal absent)
D) X_C is placed where the distributions meet