In a SPML exchange, which of the following BEST describes the three primary roles?

The PST is the target system being acted upon - it does not initiate provisioning requests - placing the PST in the requester role inverts its defined purpose in the SPML architecture.

The PSP is the provisioning fulfillment engine that receives and acts on requests - it does not originate them - assigning the PSP the initiator role confuses the processor with the requester.

While the RA correctly initiates the request, the subsequent descriptions of PSP and PST roles are either swapped or inaccurately described, misrepresenting the processing and target relationships defined in the SPML standard.

Per the OASIS SPML specification, the Request Authority (RA) is the entity that originates and submits provisioning requests, the Provisioning Service Provider (PSP) acts as the central engine that receives and fulfills those requests, and the Provisioning Service Target (PST) is the downstream system or directory where the account or resource is actually created or modified - this is the only option that correctly maps each entity to its defined role.