$(7$ points$)$ A bug is observed to crawl for $7$ seconds along a straight thin wire. Its velocity versus time graph looks as follows:

$($a$)(1$ point$)$ What is the bug's minimum velocity?

$($b$)(1$ point$)$ What is the bug's maximum acceleration?

$($c$)(1$ point$)$ What is the bug's minimum acceleration?

$($d$)(4$ points$)$ What is the bug's displacement during its $7$ seconds of crawling?