A Naval engineer uses the function, P, to analyze the effects of water pressure on submarines. The function P(d) measures the pressure exerted by the water, where d, represents the depth of the water in meters. Which of the following would be a possible domain?

A) d is the set of all domains
B) d is the set of all integers where d is greater than 0
C) d is the set of all rational numbers
D) d is the set of all rational number where 0 is less or equal to d which is less or equal to the depth of the sea floor