Two analogies that relate actions to the tools used to perform the action is given in the form "A : B. C : ?". "A : B" relates action A to tool B. Your task is to replace the question mark (?) with the appropriate tool for the given action C, following the "A : B" relation.

[Q]: iron : iron. vacuum : ?
[A]: vacuum


[Q]: bake : oven. type : ?
[A]: keyboard


[Q]: cut : scissors. unlock : ?
[A]:
key