Which of the following is MOST likely required during installation in order to legally install software?

Automatic updates are a feature that can be enabled or disabled, but they are not a legal requirement for initial software installation.

A service level agreement (SLA) is a contract between a service provider and a client, defining the level of service expected, but it is not typically required during the installation of standard commercial software.

A license key, also known as a product key or activation code, is a specific alphanumeric string that confirms a user's right to install and use a particular piece of software, validating their purchase and ensuring legal compliance. Without it, the software often cannot be fully installed or activated.

Antivirus software is a security application that is highly recommended but not a legal prerequisite for installing other software.