What constitutes 'good deliverable form' for stocks?

Good deliverable form for stocks typically involves both the physical stock certificates and a stock power, which is a document that enables the transfer of ownership from one party to another. Including a signature guarantee adds an additional layer of security and authenticity to the transaction, ensuring that the transfer is legitimate and that the signatures on the documents have been verified by a financial institution. This combination protects both the seller and the buyer in the stock transfer process.

Other options mention options such as just stock certificates or stock powers independently, which would not fulfill the complete requirement for a proper and enforceable transfer of ownership. Additionally, the notion that certificates must be in digital form does not align with traditional good deliverable form, as many markets recognize physical certificates and accompanying documentation as necessary for confirming ownership. Therefore, the answer that includes both elements along with a signature guarantee is the most comprehensive and correct approach to achieving good deliverable form for stocks.