deathtocapslock | Salazar's retirement career

It's interesting that we never hear what happened to Salazar Slytherin after he "departed" that fateful morning. Jodel suggested a couple of possibilities (included below). As a slightly tongue-in-cheek exercise, here's a quiz on his possible post-Hogwarts activities.

(a) He founded Durmstrang.
(b) He founded the Department of Mysteries (whatever it was called pre-Ministry).
(c) He started a war (maybe with pureblood supremacist ideology, maybe something else).
(d) He retired and lived a quiet life of scholarship and contemplation.
(e) He served on the Wizards' Council.
(f) He started a pet shop specializing in exotic snakes.
(g) He accidentally got killed by his own basilisk. The other Founders covered it up out of respect for his memory.
(h) The other Founders killed him and buried him under the foundations of their new Astronomy Tower.
(i) Other, explained in comments.