Collaborative software or groupware.
B. their fire characteristics
this should be fairly obvious
The correct answer is the Subject line
The subject line is usually just a very short sentence that presents the problem briefly and straight to the point.
D, an acrostic is a "a poem, word puzzle, or other composition in which certain letters in each line form a word or words."
Multiprocessing is called when in reference
to operating systems it also supports two or more processors running programs
at the same time. Hence, involves the coordinated processing of program by more
than one processor then it also increases speed of computer.