Which statement describes an example of gene therapy?

a. a virus is used to transfer human dna into a bacterial cell.

b. a defective gene is replaced with a normal gene.

c. dna banding patterns are used to identify an individual.

d. the genes for a certain desirable trait are identified.

Acompany purchased 200 units for $ 40 each on january 31. it purchased 170 units for $ 50 each on february 28. it sold 225 units for $ 65 each from march 1 through december 31. if the company uses the lastminusin, firstminusout inventory costing method, what is the amount of cost of goods sold on the income statement for the year ending december 31? (assume that the company uses a perpetual inventory system