Indicates which microstructure is obtained in each case p$.)(-0\mathrm{.}75$ p$.)$:

a$)$ A$-$ Coarse perlite and B$-$ Fine perlite

b$)$ A$-$Fine perlite and B$-$ Thick perlite

c$)$ A$-$ Fine ferrite and B$-$ Coarse ferrite

Indicates which steel is more tempered $(1\mathrm{.}5$ p$.)($Rest $0\mathrm{.}75$ p$.)$:

Cooling rate at $700C(\frac{C}{\frac{?}{?}}s)$

a$)$ Steel $1040$

b$)$ Steel $5140$

c$)$ Steel $4340$