In each of the following cases, identify the most appropriate lack box testing technique that can be used to test the following requirements: a. "The valid values for the gender code are M'or 'F'.' b. "The number of days of leave per year an employee is eligible is 10 for the first three years, 15 for the next two years, and 20 from then on c. "Each purchase order must be initially approved by the manager of the employee and the head of purchasing Additionally, if it is a capital expense of more than $10,000, it should also be approved by the CFO d "A file name should start with an alphabetic character, can have upto 30 alphanumeric characters, optionally one period followed by upto 10 other alphanumeric characters." e. "A person who comes to bank to open the account may not have his birth certificate in English; in this case, the officer must have the discretion to manually override the requirement of entering the birth certificate number