John is upgrading a cluster from NGX R65 to R77. John knows that you can verify the
upgrade process using the pre-upgrade verifier tool. When John is running Pre-Upgrade
Verification, he sees the warning message: TitlE. Incompatible pattern. What is happening?

A.
Pre-Upgrade Verification process detected a problem with actual configuration and
upgrade will be aborted.

B.
The actual configuration contains user defined patterns in IPS that are not supported in
R77. If the patterns are not fixed after upgrade, they will not be used with R77 Security
Gateways.

C.
R77 uses a new pattern matching engine. Incompatible patterns should be deleted
before upgrade process to complete it successfully.

D.
Pre-Upgrade Verification tool only shows that message but it is only informational.