$($c$)$ Likewise, specify the microstructure of a $4340$ steel $($Figure $11\mathrm{.}24$ is shown below$)$ specimen subjected to this heat treatment.

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$100\backslash \%$ martensite

$100\backslash \%$ bainite

$100\backslash \%$ fine pearlite

$100\backslash \%$ austenite

$\backslash (52\backslash \%\backslash )$ martensite, $\backslash (42\backslash \%\backslash )$ proeutectoid ferrite, and $\backslash (6\backslash \%\backslash )$ austenite

Attempts: $0$ of $3$ used

$\backslash (50\backslash \%\backslash )$ martensite and $50\backslash \%$ austenite

$\backslash (58\backslash \%\backslash )$ pearlite and $\backslash (42\backslash \%\backslash )$ proeutectoid ferrite