$\vec{A}$ isa vector with direction cosines $\cos \alpha ,\cos \beta and\cos \gamma \dot{}$ Assuming the $y-z$ plane as a mirror, the directin cosines of the reflected image of $\vec{A}$ in the plane are a. $\cos \alpha ,\cos \beta ,\cos \gamma$ b. $\cos \alpha ,-\cos \beta ,\cos \gamma$ c. $-\cos \alpha ,\cos \beta ,\cos \gamma$ d. $-\cos \alpha ,-\cos \beta ,-\cos \gamma$

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