'On Demand' was IBM's major business strategy and slogan under CEO Sam Palmisano in the early 2000s, making option A correct. The 'On Demand Business' campaign emphasized flexible, responsive IT services. TCS focuses on 'Experience Certainty', EMC (now Dell EMC) used 'Where Information Lives', and HP's campaigns were 'Invent' then 'HP Invent'. This represents IBM's pivot to services and cloud computing.