To determine the installed version of Certinia PSA, a system administrator must navigate to the 'Installed Packages' page within Salesforce Setup. The core application package for Professional Services Automation is named "PSA". This page provides a comprehensive list of all managed packages installed in the organization, including their publisher, version number, and installation date. While the option lists "PSA Core", this refers to the primary "PSA" package which contains the essential functionality of the application. This is the standard and correct procedure for verifying application versions within the Salesforce platform.

B. Go to Setup > Installed Packages > PS Enterprise: "PS Enterprise" is not the official name of the Certinia PSA managed package. This option refers to a non-existent or incorrectly named package.

C. Go to Setup > Installed Packaqes > FinancialForce Central: "FinancialForce Central" (now Certinia Central) is a foundational package that provides common components and shared functionality across multiple Certinia applications, but it is not the PSA application itself.

1. Certinia PSA Spring 2024 Administrator Guide: In the "Upgrading PSA" chapter, the guide instructs administrators on the prerequisite steps. It states, "Check the version numbers of the Certinia packages that you have installed. To do this, from Setup, search for and select Installed Packages." This confirms the navigation path and the need to check the package list.

2. Certinia PSA Spring 2024 Release Notes: Page 5, under the section "Packages in this Release", lists the official package names. The primary package is explicitly named "PSA". This document validates that "PSA" is the correct package to check for the application version.