(Chapter 2,#4, p.46) Consider the set of rights { read, write, execute, append, list, modify, own }. (a) Using the syntax in Section 2.3, write a command delete_all_rights( (p,q,o) that causes subject p to delete all rights the subject q has over an object o. (b) Modify your command in (a) so that the deletion of rights can occur only if subject p has modify rights over object o. (c) Modify your command in (a) so that the deletion of rights can occur only if subject p has modify rights over object o and subject q does not have own rights over object o