$1$ Ithe correlatlon coefficient between the retums on Stock $C$ and Stock $D$ is $1,$ the standard deviation of return for Stock $C$ is $20$ percent, and that for Stock D Is $5$ percont, calculate the covarlance between Stock $C$ and Stock $D.$

onasos

Mustiplo Choles

$25\%$

$-25\%$

$100\%$

$-100\%$