msi x399 gaming pro carbon ac

I have the MSI X399 Gaming Pro Carbon AC motherboard with a first generation Threadripper 1950X. In the UEFI, it allows me to select between 3 options for the security device -- the AMD CPU fTPM, an Offboard LPC TPM, or an Onboard SPI TPM. I'm well aware that the AMD CPU fTPM is the one that...