6. Alpha Financial, Inc., uses a variety of techniques to manage counterparty risk. It has entered into an interest rate swap with Beta, Inc. Currently, Alpha's position in the swap has a - $1 million mark-to-market value. Based on the information provided, which of the following credit risk mitigation techniques would be most advantageous to Alpha if Beta defaults?

A. Close-out.

B. Collateralization.

C. Netting.

D. Walkaway.