Which timestamp?

Remember from the slides that we have 3 timestamps available, "timestamp in payload", message.timestamp and datetime.utcnow().

In which sequence should we use the available timestamp from a datastream and why?

50 XP

message.timestamp, then "timestamp in payload" - since the timestamp in the payload could be missing.
press1
"timestamp in payload", then message.timestamp - the timestamp added to the payload is the most accurate one, closest to the measurement, and the broker comes next.
press2
datetime.utcnow(), then message.timestamp - because the consumer knows the exact time, while the broker may not.
press3
"timestamp in payload", then datetime.utcnow() - the timestamp added to the payload is the most accurate one, closest to the measurement, and the consumer comes next.
press4