Ty, a merchant, wrote to Marcus : "August 1, i offer to sell you one Model A Desktop Computer System, price $1,000. This is a firm offer for 30 days from the above date (signed) Ty". A) On August 10, Marcus received a letter from Ty: " I hereby revoke my offer August 1." On August 17, Marcus wrote to Ty: "i hereby accept your offer of August 1." is there a contract? Explain. B) Assume that Ty's offer stated that it was a firm offer for four months, and that on November 15, Marcus mailed an acceptance. Is there a contract? Explain. C) Assume that Ty's offer stated that it was a firm offer for four months, and that on November 14, Marcus received a letter from Ty, dated November 12: " I hereby revoke my offer of August 1." On November 15, Marcus mailed an acceptance. Is there a contract? Explain.