What Does the Index="100" Refer To, in the Following Example

Multiple Choice

What does the index="100" refer to, in the following example of an action group definition in Share? <action index="100" id="start-sop-workflow" />

A) The fade delay in milliseconds for the action in the user interface.
B) The index id of the icon to be used for the action.
C) The index id of the action item in the data dictionary.
D) The ordering of the items in the action items in the display.