In Autodesk Revit for Electrical Design, arrowheads on leader lines—such as those used with tags, text notes, or annotations—are controlled through Type Properties, not through instance properties or free-end options.

According to the Revit MEP User’s Guide – Annotating Chapter (Chapter 47 and 42), the section “Modifying Tags” explains:

“Select the tag, and on the Properties palette, click (Edit Type). In the Type Properties dialog, select a value for Leader Arrowhead to add an arrowhead to the leader line.”

This confirms that the arrowhead is defined at the type level, meaning any change applies to all tags or text notes of that annotation type throughout the project. The Leader Arrowhead property allows the designer to choose from predefined arrowhead styles (like “Filled Arrow,” “Dot,” “Tick Mark,” etc.), which are defined globally under:

Manage tab → Settings panel → Additional Settings → Arrowheads.

Furthermore, the document specifies under “Leader Arrowhead Properties”:

“Sets the arrowhead shape on the leader line. The value is the name of the arrowhead style defined by the Arrowheads tool.”

This behavior applies to all annotation categories, including text notes, keynotes, material tags, and electrical device tags, maintaining consistency across all view types in an electrical project.

Therefore, Option C is the correct answer because arrowheads are configured via Type Properties, while the other options are inaccurate:

Option A (Free End) only defines leader attachment behavior.

Option B (Instance properties) does not include a “Leader Arrowhead” toggle.

Option D (Enable Leader Line) only adds or removes a leader line, not the arrowhead style.