If we denote the height of a place above sea level by a positive integer and depth below the sea level by a negative integer, write the following using integers with the appropriate signs:

a) 200 m above sea level


b) 100 m below sea level


c) 10 m above sea level


d) sea level


A. + 200 m


B. -100 m


C. + 10 m


D. 0 m


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