(a) A PIN (personal identification number) is input into a banking app by the user. Before the PIN is accepted, the following validation checks are performed: - check 1 - each character must be a digit - check 2 - there must be exactly four digits - check 3 - the value of the PIN must be between 1000 and 9999 inclusive. Describe each validation check. Check 1 \_\_\_\_ \_\_\_\_ \_\_\_\_ \_\_\_\_ Check 2 \_\_\_\_ \_\_\_\_ \_\_\_\_ \_\_\_\_ Check 3 \_\_\_\_ \_\_\_\_ \_\_\_\_ \_\_\_\_ [6] (b) The PIN can be changed by the user. Describe how the new PIN could be verified before use. \_\_\_\_ \_\_\_\_ \_\_\_\_ \_\_\_\_ \_\_\_\_ \_\_\_\_ [3]

2022 - O/N - 0478/21 | Q3

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(a) A PIN (personal identification number) is input into ...