Pass Pass 1♦ Double
1NT all pass
My point was:
a)
Declarer seems to hold a clubsuit - as no major was bid, nor support for his partners opening suit. Yes I know he might bid 1NT - with some kind of major suit - and maybe a lot of diamonds for his partner.
The take-out double should have majors (other suits) - and as we seem to have some kind of lenght in spades rather chose a spade.

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