2. Asynchronous CTL model checking. Write down the following requirements as CTL formulas and analyze the properties using the model checking algorithm presented in class on the NYC subway example using the asynchronous system composition. If there is a counterexample to the property, provide one. a. The local and the express train are never simultaneously on the shared track. b. The express train always eventually reaches the shared track. c. Whenever the local train approaches the shared track, it will eventually reach the shared track. 2. Asynchronous CTL model checking. Write down the following requirements as CTL formulas and analyze the properties using the model checking algorithm presented in class on the NYC subway example using the asynchronous system composition. If there is a counterexample to the property, provide one. a. The local and the express train are never simultaneously on the shared track. b. The express train always eventually reaches the shared track. c. Whenever the local train approaches the shared track, it will eventually reach the shared track