What type of variable can be used only within the statement block in which it is defined?

Which of the following is NOT a suggested practice before using a newly configured wireless network?

A. change the administrator password B. change the manufacturer's default key C. use the default encryption method D. alter the default channel

RAID level 0 can increase performance ________.

a) at the expense of capacity b) but does not implement striping c) but does not provide fault-tolerance d) all of the above