Resistor AA has resistance $445,$ resistor BB has resistance $329,$ resistor CC has resistance $227,$ and resistor DD has resistance $125.$

a$)$ What is the combined resistance of resistors AA and BB in the circuit?

$1,260$

$116$

$774$

$189$

b$)$ What is the combined resistance of resistors CC and DD in the circuit?

$-102$

$-278$

$80\mathrm{.}6$

$352$

c$)$ What is the equivalent resistance of all four resistors?

$855$

$73\mathrm{.}0$

$90\mathrm{.}0$

$693$