Central clearing is the most common type of clearing in today's exchanges. Central clearing involves the use of a central counterparty (CCP) or clearinghouse that acts as an intermediary between the buyer and seller in a transaction. The CCP assumes the counterparty risk associated with the transaction, effectively becoming the buyer to every seller and the seller to every buyer. This arrangement allows for the standardization of contracts in terms of maturities, underlying assets, delivery terms, etc., enabling the CCP to offset all transactions easily. The central clearing mechanism significantly reduces the counterparty risk and enhances the efficiency and stability of the financial markets.

Choice A is incorrect. Bilateral clearing, while still used in some over-the-counter (OTC) markets, is not the predominant method utilized in exchanges today. This method involves two parties directly settling their trades with each other, which can lead to increased counterparty risk and operational inefficiencies.

Choice C is incorrect. Not all types of clearing and netting are predominantly utilized in exchanges today. As mentioned earlier, bilateral clearing is less common in modern exchanges due to its inherent risks and inefficiencies.

Choice D is incorrect. It's not true that none of the options are used in current financial landscape. Central clearing, as indicated by choice B, has become the standard for most exchange-traded derivatives due to its ability to reduce counterparty risk and increase market efficiency.