Final answer:
In Alberta, an approved helmet must have the DOT certification, which indicates it meets important safety standards.
Step-by-step explanation:
To determine if a helmet is approved in Alberta, the best method is to look for the DOT certification. This safety standard, issued by the Department of Transportation, indicates that the helmet has met specific safety requirements. It is not sufficient to check for an Alberta logo, verify through online registration, or consult the manufacturer's website for approval, as these do not guarantee that the helmet meets the necessary safety standards set by DOT.