PCA (Prometheus Certified Associate) sample exam question with answer 331

Question:
What query will return all the instances whose active memory bytes is less than 10000?

1. node_memory_Active_bytes < 10000
2. node_memory_Active_bytes !< 10000
3. node_memory_Active_bytes > 10000
4. node_memory_Active_bytes{< 10000}

Answer:
A - correct answer