Research Questions CMD-vs-Entrypoint

In one of the question “Which of the below steps can help minimize the build time of images?”
why the option “Only install necessary packages within the image” is not a correct answer ?
If we install only necessary packages then it will take less time to build the image while installing unwanted packages also will increase the build time.
Refer below snapshot

Thanks for the notice we will fix it.

It’s fixed, kindly check again.