Which Is a Non-Functional Requirement

Multiple Choice

Which is a non-functional requirement?

A) The system must provide logon security at the operating system level and at the application level.
B) Each input form must include date,time,product code,customer number,and quantity.
C) The system must be operational 7 days a week,365 days a year.
D) The website shall report online volume statistics every four hours and hourly during peak periods.