EverydayRewards 3-Week $10 off $50 shop - Shop ANY of the weeks or ALL of the weeks?

Hi All,

I received an email from Everydayrewards that say:
Simply spend $50 in one transaction by 1 April 2015 and remember to scan your Everyday Rewards card to receive $10 off instantly.

Image Within shows:
Week 1 - 26 MAR 15 TO 1 APR 15 SPEND $50*
Week 2 - 2 APR 15 TO 8 APR 15 SPEND $50*
Week 3 - 9 APR 15 TO 15 APR 15 SPEND $50*

Is this an offer that can be taken up ANY of the weeks, or must it be ALL of the weeks?

I did not use the Week 1 and Week 2 discount at all.
Now, Week 3 is around, and I am wondering: if I go and shop $50 worth, will I get the instant $10 off for Week 3?

T&C says

Promotion runs from 26 March 2015 to 15 April 2015. Spend $50 or more in one transaction at Woolworths supermarkets and scan your registered Everyday Rewards card in each of the three designated weeks of the Promotion to receive a saving of $10

"each of the three designated weeks":
(a) Could it simply mean: remember to present the everydayreward card each time. (We don't want to bombard you with an offer email each week, so we have combined 3 weeks' offer.)

OR

(b) You MUST shop in the earlier week(s) to keep the discount going?

When I logon to my Everydayrewards account, it still shows as a valid offer with "6 days to expiry". So, at the moment, I am leaning towards (a).

Perhaps someone here knows? Many thanks in advance.

EDIT/UPDATE: Looks like it is an offer for ANY of the weeks. An email came with this:
"…Don’t forget there's still 1 more week to go!
You'll receive $10 off your shop instantly when you spend $50 by 15 April 2015. Here's how …"