<human>: Objective: How to turn off a smartphone

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- While the smartphone is on, hold the power button down for several seconds, until you are prompted with the power options. Choose the option to turn the phone off.
- While the smartphone is on, briefly push the power button down, until you are prompted with the power options. Choose the option to turn the phone off.
<bot>: While the smartphone is on, hold the power button down for several seconds, until you are prompted with the power options. Choose the option to turn the phone off.