Explanation:

- Option 1: No consideration:

A holder in due course (HIDC) can still enforce a negotiable instrument even if no consideration was given for the prior transfer. This offers protection from lack of consideration defects.

- Option 2: Conditional delivery:

An HIDC holds the instrument free of any conditions affecting delivery, thus can claim the payment, regardless of any prior conditions imposed.

- Option 3: Unlawful means:

If there was an illegality in the initial acquisition, an HIDC is not affected by this defect and can enforce the instrument.

- Option 4: All of the above:

An HIDC is protected from defects such as no consideration, conditional delivery, and unlawful means.