Which of the following definitions describes a circuit breaker ground fault circuit interrupter (gfci)?
a. includes an extension cord
b. replaces a circuit breaker on the main circuit board
c. fits into the standard outlet box
d. used when permanent protection is not available

A ground fault circuit interrupter (GFCI) is a device that closes off an electric power circuit when it notices that current is curving alongside an unintentional path, such as over water or an individual. Circuit breaker GFCIs are frequently used as substitutes for standard circuit breakers and offer GFCI guard to all holders on that discrete circuit. So therefore, the answer is B.

I'm thinking it's the egg beater.

If you can remember when you could actually buy a black-and-white tv, then you’re old.