Solve the following recurrences using the master method:

$($a$)$ T $($n$)=2$T $($n$/4)+1$

$($b$)$ T $($n$)=2$T $($n$/4)+$

$($c$)$ T $($n$)=2$T $($n$/4)+$ n

$($d$)$ T$($n$)=2$T$($n$/4)+$ n$2$