If the server is online, then the alarm is armed. If the alarm is armed, then the screen is lit. Given that the server is online, which statement must be true?
Answer and explanation
Correct answer: D. The screen is lit
- Step 1: Chain the rules: the server is online gives the alarm is armed, and the alarm is armed gives the screen is lit. Step 2. So the screen is lit must be true. Answer: The screen is lit. Why not the others: The statement about whether the heating runs has no link to any rule; denying the screen is lit contradicts the chain; and 'nothing can be deduced' ignores that the rules chain.
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