Earl, an eccentric lottery winner, promised to pay Dubb, a 22 year-old graduate student, $1,000 in four equal monthly installments, beginning in 30 days. Which of the following would be valid consideration in the formation of a contract between Dubb and Earl: Dubb's promise to refrain from smoking for four months Previous research Dubbs performed for Earl without any agreement. Dubb's solemn vow to regularly call Earl in the coming years. Dubb's agreement to represent Earl in a legal matter in a venue, which requires Dubb to have a law license