Section 2(1)(t) can be applied as a simple inclusion test run once against each of the four items, and then the results are assembled into the matching option.
Test, item by item:
Digital data (I) fits data or record stored electronically, so it is included. Image or sound stored or transmitted electronically (II) is named directly in the definition, so it is included. Microfilm and computer-generated microfiche (III) are also named directly, so they are included. Information recorded only on paper without electronic processing (IV) matches none of these categories, so it is excluded.
Assembling the result:
The items that pass the test are I, II and III, while IV fails, giving a final set of exactly three included items.
Conclusion:
Checking the options against this assembled set, only the option listing I, II and III matches, since every other option either adds the excluded item IV or drops one of the three included items.
The Information Technology Act's definition of "electronic record" exists to bring within the law's protection anything that exists or moves through electronic means, while leaving traditional paper documents to be governed as before. Testing each item against that dividing line shows which combination is correct.
Since items I, II and III each involve some electronic process while item IV involves none, only the first three fit the purpose behind the definition.
Therefore, the correct answer is I, II and III.