Question: Which of the following attributes is not required to have confidentiality protection when transferred over the N32-f interface, according to the Data-type Encryption Policy?
Option 1: Authentication Vectors
Option 2: SUPI (Subscriber Permanent Identifier)
Option 3: Location data, e.g. Cell ID and Physical Cell ID
Option 4: Cryptographic material
Explanation: According to the text, SUPI should be confidentiality protected when being sent over the N32-f interface, but it is not a requirement according to the Data-type Encryption Policy (it's mentioned as "should" instead of "shall"). In contrast, the other options are required to have confidentiality protection.