PCA (Prometheus Certified Associate) sample exam question with answer 258

Question:
Which of the following is a function or operator defined in PromQL?

1. concat
2. equals ( == )
3. select
4. where

Answer:
B - correct answer
A - this is not a function or operator defined in PromQL
C, D - is incorrect. While this is a keyword in SQL, it is not a part of PromQL