What is the best definition of ‘router’?

 What is the best definition of ‘router’?

A. a portable computer shaped in the form of a notebook and capable of advanced handwriting recognition via use of a stylus or on-screen keyboard.
B. a specialized computer which connects two networks
C. a computer using a relatively slow and specialized processor and ROM chip, normally used to control a particular device such as a washing machine or an MP3 player

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