1. [15 points) An Internet database needs to maintain information about host machines (identified by IP address, with name, location and software as attributes), directories (identified by name, with filename and modification date as attributes), and clients (identified by IP address, with client_name as attributes). Each client accessing to a host machine is associated with a timestamp. A directory is the only one that exists on a given host. All directories can be classified into either root or non-root. While a root directory has no parent, each non-root directory has a parent which is also a directory. A non-root directory is associated with its access ermissions. Draw an ER ram for this Internet database. Note that you should identify the primary key attributes on the diagram