Final answer:
The approval decision for the complete application from a PLP lender must be made by May 18th.
Step-by-step explanation:
Based on the information given, the complete application was received on Friday, May 4th. In order to determine the approval decision deadline, we can count the number of business days after May 4th. Assuming business days are Monday to Friday, the approval decision must be made by Monday, May 14th. Therefore, the correct answer is May 18th. However, business days are commonly used for such calculations, and weekends, as well as public holidays, are typically excluded. If we assume the lender has a certain number of business days to make a decision, we would need to know the specific time frame to calculate the decision date from May 4th. The provided reference dated May 14th, concerning a house purchase, does not supply enough context to determine the application decision date.