Visa Waiver program eligibilty

[gmandu]

I was an Indian citizen when I applied for a student visa to US, which got rejected twice. Following which, I accepted an offer from Aus university and proceeded to Australia. Now after 3.5 years, I may be travelling to US for 10 days for some university trip as an Australian citizen. I see in the I-94W form that there is a clause which says "were u rejected an US visa before?" or similar. Since I had the visa rejected under Indian nationality, will I be eligible to travel under the Visa waiver program with Australian nationality or I need to apply for a visa? Any replies will be appreciated. Thanks