This is 1 question wiht part a,b.c please asnwer carefully and correct for an upvote

Which of these forms of margin alignment is best for headings and short announcements (but not for complete messages)? Left-justified text Right-justified text Centered text Sans serif typefaces are best used for which of these situations? Check all that apply. Headings and signs containing short phrases Longer messages requiring continuous reading Web pages intended to look simple and clean Messages requiring more formality