Synthesize a rule for the crime of conspiracy from the following cases Case 1: The defendant and Todd agreed to commit a crime on the following evening. Held: The defendant entered into a conspiracy. Case 2: The defendant agreed to help Shelly commit a crime on the following evening, but the defendant thought Shelly was joking. Held: The defendant did not enter into a conspiracy. Case 3: Daniel agreed to help Paul commit a crime on the following evening. Paul was an undercover police officer who never intended to complete the crime. Held: Paul did not enter into a conspiracy