First of all heartiest congratulations to Singh for winning the reward. Hope many of your other Ask expert questions will cross the 1000 visitors mark in future.
@ Rani, The award is given to all the members (irrespective of memebrship levels). the only criteria is that your Ask Expert question must get a minimum of 1000 good quality genuine visitors.
You can refer to below thread for more information about this reward program.
"Winners don't do different things, they just do things differently"