Input design: a turnaround document—generated by the system and later returned as input—can take which machine-readable forms?

Introduction / Context:
A turnaround document is produced by an information system and then returned with added markings or data so it can be re-entered as input efficiently. Classic examples include utility bills with scannable lines or forms with encoded areas. The question asks which machine-readable forms a turnaround document can take.

Given Data / Assumptions:

• System generates a document with machine-readable features.
• User adds or confirms data and returns the document.
• Re-capture occurs via automated readers (card, OCR, barcode, OMR).

Concept / Approach:
Historically, punched cards were a turnaround medium (cards mailed or sent back to be read again). More commonly today, OCR (optical character recognition) documents or barcoded coupons are used and scanned back into the system. Therefore, both machine-readable forms listed are valid examples of turnaround documents.

Step-by-Step Solution:

Verification / Alternative check:
Systems analysis literature regularly cites OCR forms and historically punched cards as turnaround media; modern analogs include barcoded payment stubs.

Why Other Options Are Wrong:

Common Pitfalls:
Designing nonstandard forms that defeat OCR accuracy; always use high-contrast fonts, alignment boxes, and verification checksums where appropriate.

Final Answer:
both (a) and (b)