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A state transition diagram describes a control system's behavior in different operational modes. The initial state is"NORMAL MODE". Which ONE of the following test cases covers anINVALID sequence?
Correct Answer: D
Comprehensive and Detailed In-Depth Explanation:State transition testing validatesvalid and invalid state transitionsbased on defined rules. * D is invalidbecause it transitionsfrom DIAGNOSTIC MODE directly to EMERGENCY MODE, which isnot a valid state changein most systems. * Other options follow valid sequences according tostate transition rules.