PCA (Prometheus Certified Associate) sample exam question with answer 157

Based off the metrics below, which query will return the same result as the query database_write_timeouts / ignoring(error) database_error_total

database_write_timeouts{instance="db1", job="db", error="212, type="mysql"} 12
database_error_total{instance="db1", job="db", type="mysql"} 67

1. database_write_timeouts / merge(error) database_error_total
2. database_error_total ignoring(error) / database_write_timeouts
3. database_write_timeouts / group_left database_error_total
4. database_write_timeouts / on(instance, job, type) database_error_total

Answer:
D - correct answer