Choose the statement below which would best describe the

purpose of a firewall.

$($a$)$ Software program used to check and prevent malware from

taking over a computer system

$($b$)$ Software program used with a set of rules to block data and

sites from accessing a computer system.

$($c$)$ Software program used to spot phishing and potentially

dangerous emails.

$($d$)$ Software program used to prevent one from becoming a

victim of scams