ServiceNow's Project Management application supports the four standard types of task dependencies used in project management methodologies. A user can define any one of these four relationship types between a predecessor and a successor task. The available dependency types are:

1. Finish-to-Start (FS): The successor task cannot start until the predecessor task finishes.

2. Start-to-Start (SS): The successor task cannot start until the predecessor task starts.

3. Finish-to-Finish (FF): The successor task cannot finish until the predecessor task finishes.

4. Start-to-Finish (SF): The successor task cannot finish until the predecessor task starts.

A. One: This is incorrect. The question itself mentions two types (finish-to-start and finish-to-finish), and ServiceNow supports more than just one dependency type.

B. Two: This is incorrect. While the question provides two examples, ServiceNow supports two additional standard dependency types (Start-to-Start and Start-to-Finish).

C. Three: This is incorrect. ServiceNow's Project Management application implements all four standard project task dependency types, not just three.

1. ServiceNow Product Documentation: Create a project task dependency. In the section "Before you begin," the documentation explicitly states, "You can create one of the following four types of dependencies between two tasks: Finish to Start (FS), Start to Start (SS), Finish to Finish (FF), Start to Finish (SF)."

2. ServiceNow Product Documentation: Project task dependency fields. This document details the fields for the Project Task Dependency [pmdependency] table. The "Type" field description lists the four available choices: "Finish to Start", "Start to Start", "Finish to Finish", and "Start to Finish".