Owner agrees to sell her house to Buyer, with Buyer making monthly payments directly to Owner and Owner paying the property taxes and insurance until the final installment is received. In need of cash to finance her new business, Owner sells her interest to Lender and enters into an agreement with Buyer and Lender for Lender to replace Owner as a party to the contract with Buyer. Under the contract with Buyer, Owner is: Question 5 options: a) still obligated, as the guarantor of any required performance delegated to Lender. b) no longer obligated, due to the parties' mutual rescission. c) no longer obligated, due to the parties' novation. d) no longer obligated, due to the parties' substituted agreement and release