Which of the following relationships is rarely used in PDM (Precedence Diagramming Method)?

A.
Start-to-Finish

B.
Finish-to-Start

C.
Start-to-Start

D.
Finish-to-Finish

Explanation:
Finish-to-start: An activity must finish before the next activity begins. Finish-to-finish: An activity must finish before the next activity can finish. Start-to-start: An activity must start before the next activity can start. Start-to-finish: An activity must start before the next activity can finish.