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A combination lock requires the input of a specific series of letters or numbers to operate, which is why it is the correct answer. These locks often feature a rotating dial or a keypad where the user must enter the precise combination in the correct sequence to unlock the mechanism. The security it provides relies on the uniqueness of the combination, making it important for users to remember or securely store the combination to access whatever the lock protects.

While digital locks use codes or passwords, they often have additional features and may rely on electronic mechanisms rather than a simple combination. Padlocks can also come in combination forms, but the designation of a "combination lock" specifically emphasizes the method of operation involving a sequence of inputs. Deadbolts, generally, operate with a key or a thumb turn mechanism rather than a combination or code entry, which further distinguishes the functionality of the combination lock.