For each of the following cases, indicate $($a$)$ what interest rate columns and $($b$)$ what number of periods you would refer to in looking up the present value factor.

$(1)$ In Table $3($present value of $1)$:

$(2)$ In Table $4($present value of an annuity of $1)$:

$\backslash$table$[[,$Annual Rate,$\backslash$table$[[$Number of$],[$Years Involved$]],\backslash$table$[[$Number of$],[$Payments Involved$]],\backslash$table$[[$Frequency of$],[$Payments$]]],[$Case A$,8\%,15,15,$Annually$],[$Case B$,8\%,4,4,$Annually$],[$Case C$,12\%,8,16,$Semiannually$]]$