the Yield to Maturity $($YTM$)$on the $7$yr zero$-$coupon bonds of XYZ Inc. is $6\%$and the YTM on the $7$yr government zero$-$coupon bonds is $4\%.$What is the probability of default for the next $7$years$?$

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$10\mathrm{.}75\%$

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$6\mathrm{.}35\%$

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$4\mathrm{.}65\%$

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$12\mathrm{.}48\%$