Determine which one of the following contracts is of "commercial or business nature", and therefore contractually binding.

Select one:

a.An agreement between a large charitable organisation and its insurer regarding workers' compensation

b.

An agreement between a mother and daughter to sell cookies.

c.

A promise by a family friend that, should the parents of a particular child die or become permanently incapacitated, he will act as that child's guardian, being financially and morally responsible for the child's upbringing

a)A promise by a family friend that, should the parents of a particular child die or become permanently incapacitated, he will act as that child's guardian, being financially and morally responsible for the child's upbringing

heckout, when the supermarket accepts the customer's offer to buy the goods.

d.

Agreements between a dairy company and its customers to deliver milk each week.