Exam DP-201 topic 4 question 12 discussion

The highest voted answer is wrong. That kind of things doesn’t help. The answer given is correct.

another proof here : https://docs.microsoft.com/en-us/azure/cosmos-db/high-availability#multi-region-accounts-with-a-single-write-region-write-region-outage

Correct answer: B. Requirement is *minimized read latency at minimal cost*. Both *Data replication* and *Multi-region writes* reduce the read latency - because both options increase the number of *read regions*. Larger number of read regions => less latency. - *Data replication* allows you to have one write region and *multiple read regions*. - *Multi-region writes* is an additional option under *Data replication* that allows you to have multiple *write regions*. It also increases the number of *read regions*, of course. But multi-region writes offer more than we need here, since we do not have a requirement for faster write requests. *Multi-region writes* is a more expensive option because write requests are more expensive than read requests: - Single-region write account distributed across N regions: 0.008$ - Multi-region write account with N regions: 0.016$

Why ? there are not write requirements but there are reading requirements so i think it should be B

"for already replicated data" yes there is another answer for it

but what about the costs?

With B there z latency

Because you will need RA-RGS not just RGS.

Geo-redundancy is more related to failover mechanishms. what you need is a data replication technique here. You need to have single write region and multiple read regions to minimize the read latencies across the globe