a) Jesus Christ

b) Odysseus

c) Jayce Talis

this is him, by the way. His name is TK-421, and he is the star of the short story “Of MSE-6 And Men”.  He owns a mouse droid and is in an affair with a superior officer, who turns out to Tarkin.

The actual officer whom the trooper is in a relationship goes unspecified within the book, and isn’t listed as Tarkin specifically

However.

The officer is described as; wearing a grey suit, continuously bragging about the strength of the Death Star, and having the highest level of clearance aboard the Death Star, which is how he is able to send secret messages to TK-421

At one point the officer says he won’t be interrogating Princess Leia because Darth Vader will be doing it, meaning he’s definitely high enough in the chain of command to know that about Vader

At one point the officer jokes he just gave an “explosive” demonstration. The story takes place right around the time Alderaan is blown up. 

According to someone on Reddit, the Audible version of the story uses Tarkin’s voice for the officer in question

That armor has never been on the floor of Tarkin’s bedroom. He is very proud of his carpet and the armor goes on the chair by his bed.

Note: the country hick accent thing is because this is their first in-person meeting and TK-421 thinks Tarkin will be into that.