Give the function of the following test data used when testing a system.
i) Normal data
ii) Extreme data
iii) Abnormal data

i) Normal data- Used to check that a system can handle the sort of the data it is
expected to handle during its use.
ii) Extreme data- Used to check if the system can cope with data that lies on the boundary
of the acceptable data.
iii) Abnormal data - Used to check if the system can identify and reject wrong data without
crashing.