What is a Synch state?

• A. It is a counter that keeps track of transitions
• B. They are represented in state diagrams by Synch state symbols, which are small circles containing either a positive integer or an asterisk, indicating the counter‚Äö√Ñ√∂‚àö√ë‚àö¬•s upper bound
• C. All of the mentioned
• D. None of the mentioned