THE_STANDARD_WHITE-SPACE_CHARACTERS_ARE_THE_FOLLOWING:_SPACE_('_'_),_FORM_FEED_('_\_F_'_),?$

• A. , horizontal tab (' \tr), and vertlcal tab (' \v' ) can be tested with function.
• B. ispunct()
• C. isalpha()
• D. isgraph()