What is the issue with this Kafka consumer subscription code snippet in Java?

medium📝 Debug Q6 of 15

Kafka - Consumers

consumer.subscribe("topic1");

AThe consumer must be closed before subscribing.

BThe topic name "topic1" is invalid.

Csubscribe() cannot be called before consumer.poll().

Dsubscribe() expects a Collection<String>, not a single String argument.

Step-by-Step Solution

Solution:

Step 1: Check subscribe() method signature
The subscribe() method requires a Collection<String> argument, not a single String.
Step 2: Analyze the code
Passing a single String causes a compile-time error.
Final Answer:
subscribe() expects a Collection, not a single String argument. -> Option D
Quick Check:
subscribe() needs a collection, not a single string. [OK]

Quick Trick: subscribe() requires Collection, not String [OK]

Common Mistakes:

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