Rozi, Aiman and Isa are partners of RAI \& Associates. RAI had taken out an RM200,000 loan from Bank Bulan Bhd. A year later, Isa retired from the partnership. At the same time, Zak joined RAI as a new partner. Recently, Bank Bulan Bhd. sent a letter of demand for the repayment of the RM200,000 loan. Based on the facts above, determine whether Isa and Zak are also liable to the claim made by Bank Bulan Bhd. Support your answer with one (1) statutory provision and two (2) case authorities relating to the law of partnership