Final answer:
When starting your bus, the correct method is to hold the vehicle with the foot brake to ensure better control. The use of handbrake or engine braking is not appropriate for this situation.
Step-by-step explanation:
When starting your bus, you should hold the vehicle with the foot brake. This is because using the foot brake allows you to have greater control over the vehicle as you manage the coordination between the clutch and the accelerator. It is not advised to use the handbrake for this purpose, as the handbrake is generally used to keep the vehicle stationary when parked. Whilst engine braking is a technique used to slow down the vehicle, it is not relevant to holding the vehicle stationary when starting.