F5 GTM monitor

I have below set up. 1.2.3.4 is a VIP hosted on LTM 14.01.12.55. Now can you tell how the monitoring takes place. Do we check the health through iquery or tcp_half_open or both server { // datacenter=ABC name "abc" type bigip box { address 14.01.12.55 unit_id 1 } box { address 14.01.12.56 unit_id 2 } monitor "bigip" allowed_monitors { path_probe no snmp no svc_check no }

vs { name "1.2.3.4_80" address 1.2.3.4:80 // http monitor "tcp_half_open_server" }