Leon has 4 boxes. each box has 15 golf balls and 12 tennis balls.

which expression shows the total number of balls leon has in the boxes?

a.
4 × 12 × 4 × 15

b.
4 + 12 + 4 + 15

c.
(4 × 15) × (4 × 12)

d.
(4 × 15) + (4 × 12)

I'm terrible at math any here is appreciated.

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