What Should Be Done to Correct Bolt Holes in the Block

Multiple Choice

What should be done to correct bolt holes in the block that are pulled up [raised]?

A) The threads should be cleaned with a bottoming tap
B) The bolt holes should be tapered at the surface by chamfering
C) Both "The threads should be cleaned with a bottoming tap" and "The bolt holes should be tapered at the surface by chamfering"
D) Neither "The threads should be cleaned with a bottoming tap" nor "The bolt holes should be tapered at the surface by chamfering"