In post and core preparation must.. Extend to contrabevel. Take shape of preparation abutment

In post and core preparation must:

a. Extend to contrabevel.

b. Extend to full length tooth preparation.

c. Take same shape of natural tooth.

d. Take shape of preparation abutment.

e. A & d. ***

f. A & b.

g. D & c.

h. B & c.