Which of the following is NOT a type of firearm action?

The answer is accurate because "Semi-automatic and manual" describes two categories of firearm operation rather than a specific type of action. Bolt, lever, and pump are distinct types of actions that define how a firearm operates when cycling ammunition.

Bolt actions require the shooter to manually operate a bolt to load the next round, lever actions use a lever to perform the same task, and pump actions involve a sliding mechanism that the shooter operates to chamber a shell. These specific actions are mechanical systems that characterize certain firearms, while "semi-automatic" refers to a type of action that automatically chambers the next round after firing without manual operation, and "manual" is an ambiguous term that doesn't specify a particular action type. Thus, the inclusion of both terms as a singular type of action is misleading, making the choice of "Semi-automatic and manual" the correct answer as the one that does not represent a specific type of firearm action.