PCA (Prometheus Certified Associate) sample exam question with answer 389

Question:
The following time series return values with a lot of decimal values. What query will return values rounded down to the closest integer node_cpu_seconds_total

{cpu="0", mode="idle"} 115.12
{cpu="0", mode="irq"} 87.4482 
{cpu="0", mode="steal"} 44.245

1. node_cpu_seconds_total @floor
2. abs(node_cpu_seconds_total)
3. ceil(node_cpu_seconds_total)
4. floor(node_cpu_seconds_total)

Answer:
D - correct answer