PCA (Prometheus Certified Associate) sample exam question with answer 60

Question:
What does a span represent in regards to tracing?

1. Complete tracing coverage of all applications and services in an organization
2. A call or logical section within a larger transaction detailing response time, status code and other metadata about the call
3. Metadata about a call, including the source and destination IP and DNS names
4. An end-to-end flow of a transaction, including response times, status codes and metadata

Answer:
B - is the correct answer.
A - While having complete tracing coverage of all services in an organization is a good observability practice, it is not the definition of a span.
C - these are simply components of a span. Spans also include details such as the service name, start and end time (duration), status codes, etc.
D - this is the definition of a trace