If you see your professor on campus and have a "mental library" of what to say to her as you greet each other, you are using Question 4 options: a script. media richness. ethics. a canned plan.

a canned plan.

Explanation:

The presence of a "mental library" of scripts is indicative of a canned plan. A canned pan is a specific communication strategy that is chosen from a library of different scripts.

A script is text that instructs you on what to say or do in a particular situation.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

this is a good question! i'll do some research and come back when i have the answer!