Finish the following sentence with the best choice: How to keep the airflow vent on a fan clean from obstruction?

Choices:
- Purchase a can of concentrated air and carefully place the nozzle just short of the vent, spray until dust is removed.
- Purchase a can of concentrated air and place the nozzle against the vent, spray until dust is removed.

Answer:
Purchase a can of concentrated air and carefully place the nozzle just short of the vent, spray until dust is removed.