CONFIG_MULTIFACE_III_TTY is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k
default or selected kernelversion does not have config value CONFIG_MULTIFACE_III_TTY.
Result is shown for kernelversion 6.2.5

Multiface Card III serial support

configname: CONFIG_MULTIFACE_III_TTY

Linux Kernel Configuration
└─>Character devices
└─>Multiface Card III serial support
In linux kernel since version 2.6.12  
If you want to use a Multiface III card's serial port in Linux,
answer Y.

To compile this driver as a module, choose M here.