How would you start such a migration?

Your company is still using traditional mode VPN configuration on all Gateways and policies. Your
manager now requires you to migrate to a simplified VPN policy to benefit from the new features.
This needs to be done with no downtime due to critical applications which must run constantly.
How would you start such a migration?

A.
This cannot be done without downtime as a VPN between a traditional mode Gateway and a
simplified mode Gateway does not work.
B. This can not be done as it requires a SIC- reset on the Gateways first forcing an outage.

C.
You first need to completely rewrite all policies in simplified mode and then push this new policy
to all Gateways at the same time.

D.
Convert the required Gateway policies using the simplified VPN wizard, check their logic and
then migrate Gateway per Gateway.