IFR Clearance

Your clearance:

N1295U cleared to DuPage via radar vectors to intercept V177 JOT as filled.  Climb and Maintain 3000 expect 5000 10 minutes after departure.  Departure freq 121.0 Squawk 2631.

Based on that clearance, when do you climb to 5000 feet?
A.  You can climb to 5000 feet automatically 10 minutes after take off.
B.  When ATC tells you to climb to 5000 feet.
C.  If you lose communications then start the climb to 5000 feet 10 minutes after take off.
D.  All of the above
E.  B & C only

The correct answer is E.  Do not start your climb from 3000 to 5000 unless ATC issues you a clearance to do so.  The only reason the "expect 5000 10 minutes after departure" is in the clearance is in the case of lost communications.  If you lose communications if you are still at 3000 feet 10 minutes after t