According to the PMBOK® Guide, the process of identifying and documenting the logical relationships between project activities is the formal definition of Sequence Activities.

Core Objective: The primary purpose of this process is to define the logical sequence of work to obtain the greatest efficiency given all project constraints. Every activity and milestone (except the first and last) should be connected to at least one predecessor and one successor.

Logical Relationships (Dependencies): This process identifies how tasks relate to one another using four types of dependencies:

Finish-to-Start (FS): The successor activity cannot start until the predecessor activity has finished (the most common type).

Finish-to-Finish (FF): The successor activity cannot finish until the predecessor activity has finished.

Start-to-Start (SS): The successor activity cannot start until the predecessor activity has started.

Start-to-Finish (SF): The successor activity cannot finish until the predecessor activity has started (rarely used).

Tools and Techniques: The main tool used here is the Precedence Diagramming Method (PDM), which is used to create a project schedule network diagram.

Comparison with Other Options:

Develop Schedule (A): This is the subsequent process that analyzes activity sequences, durations, resource requirements, and schedule constraints to create the actual project schedule model.

Create WBS (C): This is a scope management process that breaks down deliverables into work packages; it does not deal with the timing or logical order of tasks.

Applying leads and lags (D): While this is a tool/technique used within the Sequence Activities process to refine the relationships, it is not the name of the process itself.