The correct answer is B) stability.
To create a balance between the three main types of operations, planning for stability operations should begin when joint operation planning begins.
The good and effective operation has to visualize, design, an plan the entire operation, defining clear necessities regarding resources, forces, space, time, and the reason for the operation. The shape phase of the operation is designed to stripping away enemy support through open lines of communication to get the freedom of action. Every military operation is different, depending on purpose, scope and the intensity or risk of the conflict.
The other options of the question were A) planning, C) offensive, and D) defensive.