Many people prefer to eat at a restaurant occasionally. At the time of placing their order, no one asks them to confirm whether they have money to pay for their meal nor do people make a promise to pay for the meal. Still, everyone ends up paying for the meal they eat without any question. There appears to be a secret force which ensures that the payment is made. Which of the following legal concepts refers to that secret force?

Select one:

a.Quasi Contract.

b.There is no contract in this case.

c.Void Contract.

d.Implied contract.