It says we can use a brushless motor, but it doesn't explicitly address the ESC (Electric Speed Controller), nor PWM (Pulse-width modulation) control. Please confirm if we can use ESC and PWM control.

Rule 3.f. says that integrated circuits that are not integral parts of a commercial motor are not permitted. A part is integral if it is manufactured as part of the whole rather than supplied separately. A ESC or PWM that is not integral to the motor is not allowed.