Final answer:
Both Technician A and Technician B are correct; a faulty switch can cause the brake warning light to come on, and the brake light circuit typically does not receive power when the ignition switch is off.
Step-by-step explanation:
The question is addressing a scenario in the automotive technology field regarding a brake warning light. Technician A believes that a faulty switch can cause the brake warning light to come on, while Technician B states that when the ignition switch is off, the brake light circuit does not receive power. The correct answer is C. Both are correct. A faulty switch, such as a brake light switch or a fault in the warning light circuitry, can certainly cause the warning light to activate. Moreover, when the ignition switch is off, typically the brake light circuit is not powered, though some vehicles may have exceptions where certain warning lights can still be activated to indicate issues. Therefore, both technicians are correct in their statements.