Which of the Following Assumptions Must Be Made Regarding the Mark-Recapture

Multiple Choice

Which of the following assumptions must be made regarding the mark-recapture estimate of population size?
I. Marked and unmarked individuals have the same probability of being trapped.
II. The marked individuals have thoroughly mixed with the population after being marked.
III.No individuals have entered or left the population by immigration or emigration, and no individuals have been added by birth or eliminated by death during the course of the estimate.

A) I only
B) II only
C) I and II only
D) I, II, and III