Right! But avira is lighter (in RAM consumption) and is better against false positives.
Edit:
This test seems to prove the opposite: http://dottech.org/freewaresr/14151
But I'm sure I've switched from Avast to AVG to Avira for RAM idle usage.
With umask you specify which permissions you are NOT giving to subsequently created files.
You must subtract the mask from 777.
In your exercise 777-731=046, that is answer c.
I'm currently using Xubuntu on an old pc and it flows so well.
Also Zenwalk is a good choice for my needs.
I used xp before but it's OBSOLETE nowadays.
I will never try vista nor 7, I'm not a gamer and I cannot see other valid reasons to download them (not to mention to waste money on...
Just one thing: an ALERT message before being suspended, to solve the problem in time and avoid the fuss of being unsuspended.
(it could save your time, too)
But this service is THE BEST!