Case-Based Critical Thinking Questions Case 1: PetPals You have been hired by PetPals Veterinary Clinic to modify its Bill Calculator application. Upon reviewing the application, you notice that alhof the controls have their default names. You also notice that the Calculate button's code uses the properties of controls in the calculation statements. Two procedures in the PetPals Clinic application need access to the same variable. You can accomplish this by declaring the variable using the keyword in the form's declarations