Eduardo is working on classifying their prime and conversion costs for the production of greeting cards. They purchase card stock and ink, has two full-time employees who work completely in the manufacturing area. They rent their facility at a cost of $1,500 per month, which includes utilities. How would Eduardo classify these costs?

a) Card stock, ink, and labor are prime costs only, and rent is a conversion cost.

b) were able to access discarded equipment with sensitive information

c) exploited the SQL injection attack vulnerability in some web application software

d) Card stock, ink, and labor are prime costs. Labor and rent are conversion costs.