Multiple choice general knowledge i think, therefore.... Acer HP IBM Dell Reveal answer Fill a bubble to check yourself C Correct answer Explanation 'I think, therefore IBM' is IBM's tagline playing on Descartes' 'Cogito, ergo sum' (I think, therefore I am), linking computing to human reasoning. Acer uses various taglines, HP has 'Make it matter', and Dell uses 'The power to do more'.