You are developing a gaming application that needs to write 100 items every second. Each item is of 2KB containing session data and game data. How many WCUs do you need to provision for your table?

Answer options:

A.100
B.50
C.400
D.200

Correct Answer: D
1 WCU provides 1KB write per second.
Items to write every second: 100
To write one item, we need: 1*2=2. Hence, we require 2 WCUs to write one item.
Total WCUs required: 2*100 = 200
Option A, B and C are incorrect since they are not the required WCUs to perform the above operation.
Reference: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ReadWriteCapacityMode.html