WHAT_DOES_‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ‚À´DESIGNATE_AN_INITIAL_STATE_IN_EVERY_CONCURRENT_REGION_OF_A_CONCURRENT_COMPOSITE_STATE‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖŒÄ_MEAN??$#

• A. If there are no transitions to a concurrent composite state‚Äö√Ñ√∂‚àö√ë‚àö¬•s boundary, then concurrent regions do not need to have initial states
• B. A transition to the composite state‚Äö√Ñ√∂‚àö√ë‚àö¬•s boundary could be added later, though, so initial states for each region should always be specified
• C. It is legal to transition directly to more than one sub-state of a concurrent composite state without going through a fork
• D. All of the mentioned