Suppose the monthly cost for manufacturing bar stools is C(x)=517 +31x, where x is the number of bar stools produced each month. Find and interpret the marginal cost for the product.A. The marginal cost is $31 per bar stool which means that manufacturing one additional bar stool decreases the cost by $31.B. The marginal cost is $31 per bar stool which means that manufacturing one additional bar stool increases the cost by $31.C. The marginal cost is $517 per bar stool which means that manufacturing one additional bar stool decreases the cost by $517.D. The marginal cost is $517 per bar stool which means that manufacturing one additional bar stool increases the cost by $517.