PCA (Prometheus Certified Associate) sample exam question with answer 402

Question:
Which of the following types of observability data is MOST closely related to the definition given below?
A numeric measurement

1. Event
2. Time Series
3. Time Table
4. Metric

Answer:
D - is the correct answer. More at what-are-metrics
A - is incorrect as an event is defined as an occurrence of something
B - is incorrect as a time series is a numeric measurement recorded over time
C - is incorrect as this is not a term commonly used in the observability space