I thought the answer should be A. We don’t need an alternate since we fall in first 3 hrs of TAF3?

Question No 1 [AIP ENR 1.1 para 10.7.2.3 & 10.7.2.7 (a)] (ATC AU-302 3.2.5 & 3.2.3)
A private IFR flight is planned to arrive at Adelaide at 250615 UTC. The destination TAF3 includes.
FM 250500 23020KT 3000 +SHRA BKN020
The nearest suitable alternate is 120 minutes away. The minimum extra fuel required to satisfy any alternate or
holding requirements is-

[a] no holding or alternate is required because arrival is within the first 3 hours
60 minutes holding is required
[c] 120 minutes alternate fuel is required
[d] 30 minutes holding fuel is required


ACVWPLS

3000 VIS is below alt for any AD in Australia.. usually its 4.4 vis for an alternate

TAF3 purely means you don't need a 30 min buffer before and after the first three hours

OPR ALTERNATES ARE STILL NEEDED ON TAF3

Thanks for your feed-back. I've changed the arrival time in that question to 250440. That makes it within 30min of the commencement of the FM but, because it's a TAF3, the 30min buffers do not apply within the first 3 hours. You don't need an alternate.