Hi Guys
I agree with all the ppl here that saying that 2NT is the best bid.
But i disagree with those who says that partner has to bid 1NT instead of 2D
i mean, partner can very well bring him 4 low spades and 5 good diamonds with 9 HCP and a contract in NT will be very poor.
Usually i won't bid NT if i have a single or a void in my partner's suit.
1NT i'd probabely bid in a pair event and 2D in teams' event.