The devices and outlets in each circuit in a household are wired in parallel. The main reason for this is Select one: O a. unplugging a device does not affect the other devices on the circuit O b. connecting the devices in parallel is safer than if they were in series O c. plugging in more devices decreases the total resistance on the circuit O d. plugging in more devices increases the total resistance on the circuit A 20 9 resistor, a 30 9 resistor, and a 40 $2 resistor are connected together in parallel. Their combined resistance is Q . Record your answer to two digits, include a decimal if needed