The pixel aspect ratio of a standard-format, standard-definition video is _____.

The Error Checking button displays as a ________

A) red square B) yellow diamond C) blue circle D) purple arrow

It is best to secure your wireless network in order to prevent which of the following types of attacks that involve the attacker using a portable computer and an omnidirectional antenna?

A. spamming B. war drive C. port-scanning D. sniffer attack