Correct answer - "20" : One read capacity unit represents one strongly consistent read per second
for an item up to 4 KB in size. If you need to read an item that is larger than 4 KB, DynamoDB
will need to consume additional read capacity units.
1) Item Size / 4KB , rounding to nearest whole number.
a. So, in the above case , 6KB / 4 KB = 1.5 or 2 read capacity units.
2) 1 read capacity unit per item (since strongly consistent read) × No of reads per second
a. So, in the above case 2 x 10 = 20 read capacity units.