Determine whether each of the following scenarios best reflects features of Sweezy, Cournot, Stackelberg, or Bertrand duopoly.Each answer can only be used once.

a. Each firm believes rivals will hold their output constant if it changes its output.

b. Each manager engages reacts optimally to prices charged by competitors.

c. The manager of one firm gets to observe the output of the rival firm before making its own decision.

d. The managers perceive that rivals will match price reductions but not match price increases.