The answer is B. Salt the MAC address for each device.
Salting is a technique used to protect passwords by adding random data to them before they are encrypted. This makes it more difficult for attackers to crack the passwords, even if they have access to the encryption key.
In the context of location data, salting the MAC address would make it more difficult for attackers to track the devices that are sending the data. This is because the attacker would not be able to uniquely identify the devices without knowing the salt value.
From Cisco DEVCOR 350-901 Study Guide:
Meraki developed location services with privacy in mind. Because the location data contains raw MAC addresses, Meraki implemented several security mechanisms to anonymize the data in an irreversible fashion. The Meraki cloud stores only hashed, salted, and truncated versions of the MAC addresses so that they are not identifiable.
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