Which is the key difference between Bertrand model and Cournot model?a$.$ In Cournot' model, firms set output rather than prices. In Bertrand's model, firms set price rather than output.b$.$ Only in Bertrand model, there is assumption of no entryc. Only in Cournot model, there is assumption of identical productsd. None of the above

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A comparison of the Bertrand and Cournot equilibria $(1$ Point$)$