Alternate timeline (Day of the Daleks)

After they first developed reliable time travel, the Dalek Empire used it to go back and create an alternate version of the 22nd century, allowing them to try the 2150s Dalek invasion of Earth over again after its prior foiling. (TV: Day of the Daleks, PROSE: The History of the Daleks, etc.)

According to the Dalek Survival Guide, this constituted "version of history C" of the invasion, after the version foiled by the First Doctor and another, similar one. (PROSE: Dalek Survival Guide)