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When placing a placard

A It should be at least three inches away from any other markings
Explaination
Among other requirements, hazardous materials placards must be placed at least three inches away from any other markings; away from ladders or other attachments or devices; on backgrounds of contrasting color; and upright, with words or numbers level and reading left to right.
B It could be placed under a ladder if space is an issue
C It can be affixed to a background of similar color
D It can be upside down