Which license enables the one-X Portal application for a user?

The one-X Portal is a web-based application providing call control, IM, and presence. It is enabled by multiple user profiles: Option A (Office Worker), Option B (Power User), and Option C (Teleworker), depending on the user’s role, making Option D ("All of the above") correct. Each profile includes one-X Portal access with varying additional features.References: Avaya IP Office one-X Portal User Guide, Licensing Guide.