Given the security levels TOP SECRET, SECRET, CONFIDENTIAL, and UNCLASSIFIED (ordered from highest to lowest), and the categories A, B, and C, specify what type of access (read, write, both, or neither) is allowed in each of the following situations.

Assume that discretionary access controls allow anyone access unless otherwise specified. Simple security property says that a subject can read to object if subject compartment dominates object compartment. *-property says that subject can write to object if object compartment dominates subject compartment. Let (L,C) and (L, C) be compartments for different entities. ((L,C) dominates (L,C) L L and C C) is the principle we are going to apply to specify what type of access that the following sentences have.

(a) Alice, cleared for (Top secret, {A,C}), wants to access a document classified (secret, {A,C}).

(b) Bob, cleared for (Confidential, {C}), wants to access a document classified (Unclassified, {A,B}).

(c) Claire, cleared for (Secret, {C}), wants to access a document classified (Unclassified, {C})

(d) Harry, cleared for (Top secret, {A,C}), wants to access a document classified (Confidential, {B}).

(e) Loma has no clearance, but wants to access a document classified (Confidential, {B}).