SQL Server Always On Cluster

Hi,

I am going to create a AlwaysOn Cluster with 4 nodes (2 nodes A & B in one data center and another 2 nodes C & D in another data center).
Here A will be Primary Active Node, B will be sync replica while C & D will be async replica. Every year for almost a month we will do the manual fail over and C will be the Primary replica, D will be sync replica and A & B will be async replica.

Here my question is: Which quorum configuration will be best: 
1. No Quorum
2. File Share
3. Azure Storage Share

& How many SQL Servers will be licensed?

All thoughts are welcome.