A multidivisional corporation that manufactures large steel tanks is considering starting a new business unit to serve the transportation industry. The company is utilizing the industrial organization $($I$/$O$)$ model of above$-$average returns to develop its strategy. Which of the following decisions is consistent with this model?

a$.$ The company determines that it has an internal asset in a piece of software it developed for scheduling manufacturing processes and decides to make the software the centerpiece of its new business unit, selling it to transportation companies to manage their schedules.

b$.$ The company identifies a large steel tank it is currently selling to customers in the brewing industry and decides to begin selling it to customers in the transportation industry for transporting liquids.

c$.$ The company's research into a new railcar guideline that requires all tanker cars to be replaced or retrofitted over the next five years leads its leaders to start a business that manufactures tanker cars to capitalize on the new demand.

d$.$ The company decides to increase its investment in research and development to catch a competitor that has surpassed it in the technology it is using to produce steel tanks.