Which of the following equation can be used to determine the expected number of adequate gaps that will take place at an unsignalized intersection or at the merging area of an expressway?

• A. P(0) = P(h>0, h=0) = e t
• B. P(0) = P(h=0) = e t
• C. P(0) x P(h>0) = e t
• D. P(0) = P(h>0) = e t