Which of the Following Is a Definition of 'Quality

Multiple Choice

Which of the following is a definition of 'quality'? 

A)  Quality is meeting (internal or external) customer's requirements that have not been formally agreed between a customer and a supplier. 
B)  Quality is meeting (internal customer's requirements that have been formally agreed between an internal customer and a supplier. 
C)  Quality is meeting (internal or external) customer's requirements that have been formally agreed between a customer and a supplier. 
D)  Quality is meeting (internal or external) customer's requirements that have been informally agreed between a customer and a supplier.