CUDA MPS clients

Accelerated Computing CUDA CUDA Programming and Performance
1

I am reading the MPS documentation of NVIDIA and from the beginning it refers to MPS clients.
For me the term of clients is not that clear.
My question is:
MPS clients are:
a) the different processes of the user that has started the MPS daemon?
or
b) the different users that ask to start the MPS daemon?

2

MPS clients are the processes that submit CUDA work after the MPS server is started.

Refer to section 3.2:

[url]GPU Deployment and Management Documentation

The MPI process A and process B are example MPS clients (in that example, where we have two MPI processes that are each submitting “work” i.e. kernels to be handled by the MPS server).