Your department creates a regular analytics report from your company`s log files stored in S3. The daily EMR jobs produce the PDF reports and the aggregated tables in CSV format as an input to the Redshift data warehouse, and these are accessed frequently. You notice that the average EMR hourly usage is more than 25% but less than 50%.

Answer options:

A.Use Glacier to store PDF and CSV Data. Add Spot Instances to Amazon EMR jobs. Use Reserved Instances for Amazon Redshift. 
B.Use standard S3 to store PDF and CSV data. Use a combination of Spot Instances and Reserved Instances for EMR and Reserved Instances for RedShift.
C.Use Glacier to store PDF and CSV Data. Add Spot Instances to Amazon EMR jobs. Use Spot Instances for Amazon Redshift. 
D.Use S3-IA to store PDF and CSV Data. Use Reserved Instances to Amazon EMR jobs. Use Reserved Instances for Amazon Redshift. 

Answer - B
Options A, C, and D are invalid. We need to access the PDF and CSV files daily. So S3-IA and glacier are not suitable for this purpose as both of these storage options are not the best for frequent access to files.