The appropriate answer is C ! all other are very limited but labour can be increased or decreased according to our will and it doesn't exhaust !
One 4-GB DIMM. Dont really have a explanation for it just comes from previous experience
It takes about 5 days I believe
<span>If a user name can have seven letters (with no distinction between upper and lower case), and if a letter can be repeated, then the maximum number of names is 26x26x26x26x26x26x26, or 8,031,810,176. That is, slightly more than eight billion names are possible.</span>
Usually it’s either 5400 or 7200RPM