For the eutectic system below, for each point name the following. $(10$ points$)$

a$.$ The composition and temperature at that point $(0\mathrm{.}5$ per location$)$

b$.$ The phases present at that point $(0\mathrm{.}5$ per location$)$

c$.$ The composition of the phases present at each point $(1$ point per location$)$

Composition $($at$\%$ Sn $)$