Collaborative auditing using a federated blockchain: (select all that apply)

	a.	reduces auditing costs not only for transactions recorded on the main auditors proprietary databases but also for cross-auditor transactions.
	b.	allows auditors to easily verify the transactions on blockchain ledgers instead of asking clients for bank statements or sending confirmation requests to third parties.
	c.	increases auditing costs not only for transactions recorded on the main auditors proprietary databases but also for cross-auditor transactions.
	d.	does not allow auditors to easily verify the transactions on blockchain ledgers so auditors still need to ask clients for bank statements or sending confirmation requests to third parties.
	e.	is based on an encryption technology that includes zero-knowledge protocols, which means that auditors can see definitive proof that a transaction happened, but others using the blockchain cant see all the details.