What does a single-user license allow a user to do?

A single-user license typically grants a user the right to install and use the software on one specific computer or for one specific user. It does not allow for multiple installations on different machines, which is why the first choice is incorrect.

The correct understanding of what a single-user license entails is reflected in the notion that users can create backup copies of the software, but this often comes with the stipulation that these backups are used solely for personal use. Additionally, a single-user license does not permit selling the software or transferring ownership to another user without permission from the software publisher, which means that the idea of selling the software after removing it is generally limited to specific licensing agreements.

The other options, which include distributing the software freely or modifying and sharing it, typically fall outside the permissions provided by a single-user license. Thus, a single-user license is quite restrictive in terms of the rights it bestows upon the user, focusing primarily on personal use and prohibiting distribution or modification without explicit permission from the software vendor.