GRE Big book Test 27 Section 2

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case 1 , when sum of equal sides is 7, then the sides are 3.5, 3.5, 4, perimeter=11
case 2, when sum of unequal sides is 7, then sides are 4, ,4 , 3, perimtere =11

but the correct answer is D. What am i missing here?

How about 4, 3, 3?

uumm, got it thanks