John and Jane agree Jane will provide accounting services to John's company for a year for $$25,000.$ John realizes the services included in the contract are not sufficient for his needs. They put the original contract into a paper shredder and enter into another contract indicating the new terms with services John wants for his business, and Jane agrees to the contract for $$35,000.$ This is an example of $a(n)$

concurrent breach

substitute contract

novation

accord and satisfaction

remediation