PCA (Prometheus Certified Associate) sample exam question with answer 98

Question:
Which of the following functions can be used to calculate the range of values within a time range for a metric in PromQL? Select all that apply.

1. range_over_time
2. quantile_over_time
3. stddev_over_time
4. topk_over_time

Answer:
A, C - quantile_over_time accepts additional parameter so it is not valid in this case. topk_over_time - do not exist