多项选择题

A. Create a custom sign-in page with specific instructions in the "Instructions" field.
B. Create a custom sign-in page with specific "Missing Certificate" messages in the "Custom error messages" field.
C. Create a custom sign-in policy with specific instructions in the "Instructions" field.
D. Create a custom sign-in notification and assign it to the "Pre-Auth Sign-in Notification" in the sign-in policy.