A、It’ s hard to limit access to information. B、It’ s hard to forbid the freedom of information use. C、It’s hard to get a balance

With the development of the computer, the possibility of storing more and more information at a central point is growing rapidly. But so is the possibility of gaining access to the stored information. And that raises serious questions regarding personal privacy. Four basic principles of privacy have emerged from various studies, and appear to be the foundation for sound public policy.
    We at IBM believe:
    1. Individuals should have access to information about themselves in record-keeping systems. And there should be some procedure for individuals to find out how this information is used.
    2. There should be a way for individuals to correct or amend inaccurate records.
    3. Information on individuals should not be improperly disclosed or used for other than authorized purposes. The custodian of data files containing sensitive information should take all reasonable precautions to make sure that the data is reliable and not misused.
    Translating such broad principles into specific and uniform guidelines is not easy. In particular, there must be a proper balance between limiting access to information for the protection of individual privacy on the one hand, and allowing freedom of information to fulfill the needs of society on the other.
Questions 19 to 21 are based on the passage you have just heard.
19. What raises the problems regarding personal privacy?
20. What is suggested by people at IBM?
21. What is the difficulty to make uniform guidelines?