A program is being developed to process bank card information. When a card number is displayed, all the characters except the last four are replaced with the asterisk character '*'. Card numbers are stored as strings. The strings are between 10 and 20 characters in length. The function Conceal() will take a string representing a card number and return a modified string. Example strings: | Original string | Modified string | |------------------------|------------------------| | "1234567890" | "******7890" | | "1234567897652" | "*********7652" | | "1234567890123456" | "************3456" |

1. (a)The function Conceal() will: • take a numeric string as a parameter representing the card number • return a string in which the asterisk character replaces all except the last four characters of the card number parameter. Write pseudocode for the function Conceal().[6]
2. (b)(i)The requirements have been changed. Conceal() will now be written as a procedure which will process 100 card numbers each time it is called. The card numbers will be stored in a 2D array CardNumber. The original string will be stored in column one and the modified string in column two. Write pseudocode to declare the array.[2]
3. (b)(ii)The new procedure Conceal() will write the modified string to the corresponding element in column two. The array CardNumber is passed as a parameter to the new procedure Conceal(). Identify how this parameter should be specified in the new procedure header.[1]