What is the main objective of developing genomic approaches for marine organisms?

A better understanding of the genetic complexity of a particular biosystem.
To avoid the need to cultivate organisms from the sample.
To develop genomic approaches that can be applied to the diversity of marine biosystems.
To obtain a broad view of the genetic composition of marine ecosystems.
a) I and II are correct.
b) II, III, and IV are correct.
c) I, III, and IV are correct.
d) II and IV are correct.