V$.$ If the simple CAPM is valid, which of the situation in Tables below is possible? Explain, Consider each situation independently. $(14$ points$)$

a$)$

$\backslash$table$[[$Portfolio$,$Expected Return,Beta$],[$Market$,10\%,1],[$Stock A$,8\%,1\mathrm{.}2]]$

b$)$

$\backslash$table$[[$Portfolio$,$Expected Return,Beta$],[$Risk Free,$10\%,0],[$Market$,18\%,1\mathrm{.}0],[$Stock A$,33\%,2\mathrm{.}5]]$