You need a NoSQL database of a supported API model, with low latency performance and at planet scale. 
Which of the following would you use?

Answer options:

A.Azure SQL Database
B.Azure Cosmos DB
C.Azure DB Server
D.Azure Database for PostgreSQL
E.Azure Database for MYSQL

Correct Answer: B 
Use Azure Cosmos DB when you need a NoSQL database of the supported API model, at planet scale, and with low latency performance. Nowadays, Cosmos Databases support five-nines uptime (99.999 percent). It is likely to support response times below 10 ms when it is provisioned correctly.
Option A is incorrect. The requirements demand a NoSQL database.
Option B is correct. Using Azure Cosmos DB is the right choice.
Option C is incorrect. Azure DB server is not the right choice.
Option D is incorrect. The requirements ask for a NoSQL database of a supported API model, with low latency performance and at planet scale which is Azure cosmos Database.
Option E is incorrect. The question asks for a NoSQL Database.
Reference: 
To know more about Azure Cosmos DB, please visit the below-given link: 

https://azure.microsoft.com/en-us/services/cosmos-db/