DNA Sequencing, Mutation and Repair - Medical Science

Q1:

The whole-genome shotgun sequencing approach depends primarily on

A rapidly sequencing thousands of small randomly cloned fragments

B methodical sequencing a few large cloned fragments of DNA

C sequencing the bacterial chromosome while it is still intact

D all of the above

ANS:A - rapidly sequencing thousands of small randomly cloned fragments

What happens in whole genome shotgun sequencing?

And where is this method used?