The first one, Accessing is so important .
I don't know but I am guessing 666 or 777 or 888.
The last option:
Avoid forwarding e-mail messages unless you have permission to do so.
Well, it is safe to turn a computer on without a RAM, but you can't really do it. RAM is one of the essential components in computers without which you can't really use a computer. You can turn it on, however, nothing will appear on your screen and the system won't boot. So, technically, it is safe, but it won't do anything to your computer as it cannot run without RAM.
