A general design rule for microwave links is $\backslash (60\backslash \%\backslash )$ clearance of the first Fresnel zone. For a $2$ km link at $5$ GHz $,$ the maximum first Fresnel zone radius and the clearance required for this system are:

a$.3\mathrm{.}47$ m and $2\mathrm{.}082$ m

b$.7\mathrm{.}47$ m and $4\mathrm{.}686$ m

C$.5\mathrm{.}47$ m and $3\mathrm{.}286$ m

d$.4\mathrm{.}47$ m and $2\mathrm{.}686$ m

e$.2\mathrm{.}27$ m and $1\mathrm{.}82$ m

f$.6\mathrm{.}47$ m and $3\mathrm{.}882$ m