FORTIGATE Cluster A-P or A-A

Good evenning specialysts.

I am in a trouble with Fortigate Cluster using LACP.

How differences in working (network visibility) between Fortigate Cluster A-P and A-A?

How Firewall negotiates LACP in each scenario?

Can I configure Cluster A-A connecting both Firewalls to a same switch?

Do I must configure one or two LACPs?

Thanks