How do you call it when you hire full-time engineering contractors?

Let's say you contract 3 React developers through an offshore software agency. They remain employees of the agency, but 100% of their time is paid by you and they don't take any other gigs. Basically they are like your full-time employees.

What term sounds most intuitive to describe this model?

A. Team extension

B. Dedicated team

C. Staff augmentation

D. Outstaffing

E. Other (please specify)

Thanks!