Which is NOT an example of pest-proofing?

The correct choice highlights that using a vacuum to remove pests does not fall under the category of pest-proofing. Pest-proofing involves implementing measures that prevent pests from entering or establishing themselves in a space. This can include sealing entry points, which involves blocking any potential openings that pests could use to gain access to a building. Similarly, installing door sweeps helps close the gaps at the bottom of doors, and repairing window screens addresses vulnerabilities that can allow insects to enter.

In contrast, using a vacuum is a method of immediate pest control aimed at removing pests that have already infested an area. While it can be a part of an overall pest management strategy, it does not prevent future infestations or block entry points, which are key components of pest-proofing.