Answer:
Name of Operating System: Ubuntu
Five legal file names:
inventory.txt
total.txt
NIKKAH.txt
Defaulter.txt
studenT.txt
Five illegal file names:
wel/come.txt
..
MY>note.txt
.
my<work.yxt
Explanation:
To fix the illegal name:
1. Remove the special character, so it becomes welcome.txt
2. Remove the double dot and rename using text characters
3. Remove the special character, so it becomes MYnote.txt
4. A file cannot be named using dot. So we rename to a textual name
5. Remove the special character, so it becomes mywork.txt
Some additional rule for naming of files legally in Unix is that, you cannot use a reserved word to name your file. Starting a file name with number is allowed. Starting a file name with dot make the file to be hidden.
The most serious security threat to Bluetooth-enabled devices is 
, which occurs when a hacker gains access to the device and its functions without the owner's consent.
Answer:
By order of increasing magnitude:
D. Make sure the USB device is plugged in properly.
A. Try a different USB cable.
B. Replace the USB device.
C. Install a new USB controller card.
Explanation:
Start with whatever is simplest first. Most errors are simply ID-10-T mistakes.
Indents? Double Space? one of those
Answer:
B. Using a Rate Rule in the Community Manager
Explanation:
Rate rules are techniques to protect your community from spammers and web bots that attack or spam your community by posting the similar message several times in a row. You can build rate rules to alert your community moderators of suspicious spammer-like activities in your community or freeze a member on the spot.
Take for example, when the universal shipping introduces a rate rule to their comunity, Community Moderators will now be alerted when a member post more than one file to the community within a 15-minute window thereby making them frooze the account accordingly.
