Which of the following is the correct expanded form for the series below? 4€n=1, (3n+7)

NOTE: "€" stands for summation notation

A.) (7+3.1) + (7+3.2) + (7+3.3) + (7+3.4)
B.) (7+1) + (7 +2) + (7+3) + (7+4)
C.) (3.1) + (3.2) + (3.3) + (3.4)
D.) 3 + 3^2 + 3^3 + 3^4 + 7
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