To answer this question, we need to understand the guidelines for defining a PIN for a medium risk Rogers' customer. Let's go through each option to understand why it is correct or incorrect:
Option A) PIN should be defined - This option is incorrect. While it is important for a medium risk Rogers' customer to define a PIN, it is not the only requirement.
Option B) PIN should be defined. If no pin, the postal code should be defined - This option is correct. For a medium risk Rogers' customer, it is necessary to define a PIN. However, if they don't have a PIN, they can use their postal code as an alternative.
Option C) PIN should be a four-digit - This option is incorrect. The statement does not provide any information about the specific length of the PIN.
Option D) None is true - This option is incorrect. Option B is true, as explained above.
The correct answer is B. This option is correct because it states that a PIN should be defined for a medium risk Rogers' customer, and if they don't have a PIN, they can use their postal code as an alternative.