Match the Snort rule source to the description.

Explanation & Hint:

GPL: This typically refers to the General Public License, and in the context of Snort, it may refer to rules that are available under this license which are often open-source and free to use.
ET: This is likely a reference to Emerging Threats, a community-driven project that provides rules for Snort.
VRT: This stands for Vulnerability Research Team, which is associated with Cisco Talos. They provide rules that are created and maintained by this team.

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