A loyal guest, Mr$.$ Malapane, has been visiting $$Rainbow Nation Resorts$,$ a luxury South African hotel chain, for several years and consistently provides feedback about his stays. This time, he encountered a minor issue during his stay and expressed his concern to the front desk. Which of the following options best aligns with relationship marketing principles to handle this situation?

a$.$

You inform Mr Malabane that such minor issues are unavoidable and offer him a discount voucher for his next stay at $$Rainbow Nation Resorts$.$

b$.$

You provide Mr Malabane with a formal written apology, explaining that minor inconveniences sometimes occur, and thank him for his continued patronage.

c$.$

You offer Mr Malabane an immediate complimentary upgrade to a suite for the remainder of his stay, along with a personalised apology letter and a basket of gourmet treats.

d$.$

You assure Mr Malabane that his concerns will be looked into after his departure, and his feedback will contribute to ongoing improvements.