the management team of a cell phone service company is debating options for customer retrieval of their voice mail messages. Some managers argue to provide quick retrieval, tha is, access to messages without a PIN when the system recognizes that the call is coming from the customer's own phone. Some managers argue that this should be an option the customer can turn on or off. Others argue that the company should always require the pin. What are some risks of not requiring a PIN? Which of the options (or others you might think of) are ethically acceptable? Which is best?