Firewalls are
a. a system to recover data during transaction processing.
b. special software used to screen Internet access.
c. a system that enforces access control between two networks.
d. special materials used to insulate computer facilities.

Anshyper sonic (sega)

Well, this code would box the whole body of an html document. by using the relative value for position, you are telling it to position relative to its normal position, which the top left corner is at (0,0). by using left: 50px, you are telling the box to set the left margin  edge to 50px and by using top: 50px, you are telling it to set the top margin edge to 50px. by doing this shifting, the top left corner of the box, which is at (0,0) would be positioned at (50,50)