inheritance and primary/foreign keys

Question 1: If table A has as its primary key "a_pk" and table B
inherits table A, then table B also has as its primary key a_pk.  Is
that correct?

Question 2: If I want table C to have a foreign key on both A and B, is
the following syntax correct? (I'm using 7.0.3)
    CREATE TABLE c (
        c_fk    correct_type    REFERENCES a*(a_pk)
    );
(The question is, Do I need the *?)

Question 3: I understand that the default action on this will reverse in
7.1 (i.e. the default will then be to reference all tables unless ONLY
is specified).  Am I correct in assuming that the dump/restore (required
for upgrading) will take care of this, or will I need to recreate table
C manually removing the *?

Thanks for your help.
--
Dan
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