PCA (Prometheus Certified Associate) sample exam question with answer 564

Question:
What is the difference between the delta and idelta query functions?

1. The idelta function considers the entire range interval while the delta function only considers the last two samples in the interval
2. There is no such function called idelta
3. The idelta function is for use with counters while the delta function is for use with gauges
4. The delta function is for use with counters while the idelta function is for use with gauges
5. The delta function considers the entire range interval while the idelta function only considers the last two samples in the interval

Answer:
E - is the correct answer. More at delta and idelta
A - is incorrect as it is actually the delta function that considers the entire range interval while idelta only considers the last two samples in the interval
B - is incorrect as there is such a function
C, D - are incorrect as both functions are only for use with gauges