PCA (Prometheus Certified Associate) sample exam question with answer 397

Question:
Given the following two time series, what is the result of the query given below?
Series:

up{job="node", instance="node1"} 0 1 1 0 1
up{job="node", instance="node2"} 1 0 1 1 1

Query:

absent(up{job="node", instance="node3"})

up{job="node", instance="node1"} 0
up{job="node", instance="node2"} 0
up{job="node", instance="node3"} 1

```
{job="node", instance="node3"} 1
```
```
{} 1
```
```
up{job="node", instance="node3"} 1
```

Answer:
B - is the correct answer. More at absent
A - is incorrect as the absent function does not return time series that are present
C - is incorrect as the result should include the labels attached to the metric passed to the absent function
D - is incorrect as the absent function does not include the metric name in the result