Explanation
The most likely cause of the notification and the slow performance of the phone is that the third-party GPS application is using up the data plan on the user's corporate phone. GPS applications require data in order to update their geospatial map data, and the data usage can quickly add up. This can lead to the user's data plan reaching its limit, and can cause the phone to slow down due to the large amount of data being used.

Explanation
According to CompTIA A+ Core 2 objectives, a full backup stored off-site provides the greatest protection against data loss in the event of a ransomware attack or other data disaster. By storing the backup in a separate physical location, it is less likely to be affected by the same event that could cause data loss on the original system. Cold storage is a term used for data archiving, which typically refers to a long-term storage solution that is used for retaining data that is infrequently accessed, but still needs to be kept for regulatory or compliance reasons.