Which of the following is not a type of spam filter?

Operationally, the ____________________ professional is involved in the collection, processing, and preservation of evidence from every meaningful incident.

Fill in the blank(s) with the appropriate word(s).

What is a metric?

a. A numeric measure assigned to a route that is used to rank routes from best to worst; the larger the number, the better b. A numeric measure assigned to a route that is used to rank routes from best to worst; the smaller the number, the better c. A numeric measure assigned to a route that is used to rank routes from best to worst; a number equal to 100 indicates the best route d. A numeric measure assigned to a route that is used to rank routes from best to worst; the number indicates the ticks