Research Questions Image Addressing Convention (Add-on)

Inspect the following output and answer the following questions:

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              c39a868aad02        4 days ago          150MB
redis               latest              4760dc956b2d        2 years ago         100MB
ubuntu              trusty              f975c5035748        2 years ago         100MB
webapp              latest              c39a868aad02        4 days ago          150MB
alpine              latest              3fd9065eaf02        2 years ago           5MB