Please help solve these problems on attachment

In three to four sentences, explain the effect of a price ceiling on the quantity of a good and who this intervention intends to assist

What two categories do strategic choices fall within? a. generic business strategies and cost leadership strategies b. business-level strategies and corporate-level strategies c. cost leadership strategies and corporate-level strategies d. diversification strategies and leadership strategies e. pricing strategies and cost-leadership strategies

One principle of usability testing is that it permeates product development. what does that mean?