How many Provisioning Services servers should the architect install in each of the three farms?

A single server in each farm would create a single point of failure, which is unacceptable for production environments requiring continuous availability.

Installing two Provisioning Services servers in each farm is a standard best practice to ensure high availability and redundancy for vDisk streaming. This configuration prevents a single point of failure, allowing target devices to continue booting and streaming from the remaining server if one server within a farm experiences an issue.

This option suggests an uneven distribution of servers across farms, which might imply varying load or criticality but does not represent a standard high availability strategy for 'each of the three farms.'