UEFI boot and different OVMF firmware files when building a VM

What is the difference between the UEFI/OVMF firmwares available in Ubuntu 22.04? Which should I use when building general purpose Windows and Linux VMs in QEMU/KVM with UEFI & Secure Boot?

1. OVMF_CODE_4m.fd
2. OVMF_CODE_4m.ms.fd
3. OVMF_CODE_4m.secboot.fd
4. OVMF_CODE_4m.snakeoil.fd
5. OVMF_CODE.fd
6. OVMF_CODE.ms.fd
7. OVMF_CODE.secboot.fd

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