For the circuit shown on Fig$1,($a$)$ what is the equivalent resistance of the threeresistor parallel combination?; $($b$)$ What is the total resistance Rtot in the circuit?

Figure $1$

$($a$)\frac{1}{3}$ ohm; $($b$)\frac{1}{9}$ ohm

$($a$)9$ ohm; $($b$)9$ ohm

$($a$)3$ ohm; $($b$)3$ ohm

$($a$)3$ ohm; $($b$)9$ ohm