What should an Administrator do to allow the value of a variable to be get by sources that started the flow?

What should an Administrator do to allow the value of a variable to be get by sources that started the flow?
A . Select "Field is required" checkbox
B . Select ‘Allow Multiple Values" checkbox
C . Select "Available for output" checkbox
D . Select "Available for input" checkbox

Answer: C

Explanation:

To allow the value of a variable to be accessed by sources that started the flow, the administrator should select the "Available for output" checkbox (C) for the variable. This setting makes the variable’s value accessible outside the flow, allowing it to be used by processes or elements that initiated the flow, facilitating the passing of data between the flow and other processes.

Reference: Salesforce Help Documentation on Flow Variables.