What is commonly referred to as 'running/rigging' on a sailboat?

The term 'running/rigging' on a sailboat specifically refers to the configuration and handling of the various ropes that control the sails. This includes lines, sheets, and halyards that are essential for adjusting the sails and managing the boat's motion.

Sheets are lines used to control the angle of the sails, halyards are used to raise and lower the sails, and other lines might include those used for adjusting the position of the boom or ensuring that sails are properly secured. All of these elements are critical for effective sail management and performance while under sail.

In contrast, other options such as anchor lines and mooring lines are related to securing the vessel in place but do not play a role in the actual operation of the sails. Safety lines are important for crew safety but are not involved in the sailing process. Therefore, the correct choice that captures the essence of 'running/rigging' is the lines, sheets, and halyards.