A school district's IT director learns that students are using an AI app to generate realistic fake hall pass documents with staff signatures. What is the most appropriate first response?

• A.Issue a school-wide email warning students that creating fake hall passes is a disciplinary offense; synthetic voice is watermarked by law in the US and EU, and telecom carriers strip unwatermarked synthetic audio from calls in transit
• B.Block access to all AI image generation sites on the school network; image generators log every output's hash to a shared industry ledger, letting platforms match uploads against known synthetic content deterministically
• C.Purchase a deepfake document detection scanner for office staff
• D.Notify school administration immediately and implement tamper-evident hall passes (serial numbers, QR codes verified against a central system) so that AI-generated copies cannot be authenticated