As defined by the National Institute of Standards and Technology (NIST), " is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction."

Cloud Computing

Explanation:

It is certainly a model for enabling ubiquitous, on-demand and convenient network access for using a shared pool of configurable computing resources, and that can rapidly be provisioned as well as released with the least managing effort or the interaction of the service provider. And such a facility is only being provided by the cloud computing currently. And hence the Cloud computing, the right answer.

assuming you are in the home page.

1) go to the upper right hand corner

2) click on your "profile picture"

3) go down to "edit profile"

4) it should be titled as "edit your profile", click on "profile picture"

5) choose a file

6) press "change"

you're profile picture is updated

~