Annie needs to provide a form field that will allow users to select from a predefined list of options but without the ability to add their own options.
which option should she use?
rich text
plain text
drop-down list
combo box

drop-down list

Explanation:

understand the definition of each of the options, and you will easily work out the answer.

See this page for differences between drop-down list and combo box: https://docs.microsoft.com/en-us/windows/win32/uxguide/ctrl-drop

Of the 4 answers, only drop-down list doesn't allow user to add own option

a

explanation:

the numbe rof computers would affect the strength of network