How many significant figures should be written in the sum 4.56 g + 9.032 g + 580.0078

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How many significant figures should be written in the sum 4.56 g + 9.032 g + 580.0078 g + 540.439 g?

(a)    3

(b)    4

(c)    5

(d)    6

(e)    7

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