According to the CAPM, how much of Microsoft's sample variance is due to market risk, and how much is due to unique/firm-specific risk?
a) Market risk: 100%, Unique/firm-specific risk: 0%
b) Market risk: 0%, Unique/firm-specific risk: 100%
c) Market risk: 50%, Unique/firm-specific risk: 50%
d) Market risk: 70%, Unique/firm-specific risk: 30%
