Which of the Following Statements About Placing Dimensions Is True

Which of the following statements about placing dimensions is true?

A) Dimension lines may be joined end to end with a line of the drawing.
B) Avoid placing dimensions on the drawing.
C) Leaders may be drawn horizontally if adjacent leaders are also drawn horizontally.
D) Fraction bars should be inclined except where the text is not clear.
E) Always include unit marks in machine drawings.