Three valid qualifiers for a Decryption Policy Rule match are Custom URL Category, User-ID, and Destination Zone. These elements can be used to create conditions under which specific traffic is decrypted. Custom URL Category allows the rule to match based on predefined or custom categories of URLs. User-ID identifies users to apply the policy based on user or group identification. Destination Zone is used to specify the zone to which the traffic is being sent, providing another layer to correctly identify the traffic for decryption. App-ID and Source Interface are not valid qualifiers for this type of rule match.