If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?

If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?

1) presumptive coliform test
2) confirmed coliform test
3) completed coliform test

The correct answer is ?
A. only (1)
B. both (1) and (2)
C. both (1) and (3)
D. all (1), (2) and (3)