If Each Department Within a Company Has Its Own AWS

Multiple Choice

If each department within a company has its own AWS account, what is one way to enable consolidated billing?

A) Use AWS Budgets on each account to pay only to budget.
B) Contact AWS Support for a monthly bill.
C) Create an AWS Organization from the payer account and invite the other accounts to join.
D) Put all invoices into one Amazon Simple Storage Service (Amazon S3) bucket, load data into Amazon Redshift, and then run a billing report.