A network manager prevents users accessing certain websites. She does this by setting up:

a) Firewall
b) An internet filter
c) An email filter
d) Access rights

A or B

Explanation:

Firewalls and internet filters are the same thing, people nowadays tend to use "internet filters" more, but again they mean the same thing.

by trying your best others ^_^

but don't try sending them fake answer, it must to be real answer.

the reason why you must not send them fake answer cause the experts and the questioner will moderate you and if they find out its fake they will report your to the owner of this website which its called

explanation:

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).