from left to right

from right to left

in a way that depends on the implementation

none of the above

takes care of conditional compilation

takes care of macros

takes care of include files & acts before compilation

All of the above

need not start on a new line

need not start on the first column

has # as the first character

comes before the first executable statement

The scope of a macro definition need not be the entire program

The scope of a macro definition extends from the point of definition to the end of the file

New line is a macro definition delimiter and it may go beyond a line.

All of the above

reduces execution time

increases code size

increases execution time

both reduces execution time & increases code size