Which "Perk-A-Cola" in "Call Of Duty: Zombies" was "reworked" in "Call of Duty: Black Ops II"?

The perk-a-cola that was reworked in Call of Duty: Black Ops II is Double Tap Root Beer. In the previous games, Double Tap Root Beer simply increased the firing rate of the player's weapon. However, in Black Ops II, it was reworked to include the additional effect of doubling the player's bullet damage. This made it a more versatile and powerful perk, giving players an advantage in taking down zombies more effectively and efficiently.