(a) Smart-bots are flexible and powerful
The correct answer is (a). Smart-bots are flexible and powerful and work on bigger databases, but no coding is required — so option (b) is incorrect, making (d) wrong too.
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The passage states there are two types of chatbots: Script-bots and Smart-bots. Smart-bots are AI-powered, flexible, and powerful. A key feature of Smart-bots is that no coding is required (they are no-code tools), which directly eliminates option (b) and therefore option (d). Examiners expect you to identify the false statement in such MCQs to eliminate "All of the above."