Discussion
Which protocol (scheme) is used in URL?
Answer: B
The Commission's key gives HTTP.
A URL begins with a scheme naming the protocol used to reach the resource, as in http://example.com. HTTP, with its secure form HTTPS, is the scheme in everyday use, and it is the one the key expects.
SMTP and ICMP are not URL schemes used to fetch resources: SMTP is for sending mail between servers and ICMP is a network-layer error and control protocol. FTP is the awkward option, because ftp:// is also a valid URL scheme, so the stem does not single HTTP out strictly. On this paper the keyed letter is HTTP.
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