Please answer the following question below correctly. I'll make sure to give a thumbs up. Thanks!

Compute covariance between these portfolios: Stock A 6% 8% 10% 12% A. (0.649,0,0.694) B. (0.694,0,0.649) C. (0.649,0.694,0) Compute the return on the following portfolios ( 80% stock A, 20% T-Bill), ( 80% stock B, 20% T-Bill), ( 50% Stock A, 50% S6ock B)