In Microsoft Purview Exact Data Match (EDM) classifiers, a primary element is a unique, identifying field used for data matching. EDM allows up to two primary elements per schema.
From the provided table, the Match mode indicates how data is analyzed:
# PP (EU Passport Number) # Likely a primary element because it's unique.
# Name (All Full Names) # Typically not a primary element as names are common.
# DateOfBirth (Single-token) # Usually a secondary element, not unique.
# AccountNumber (Multi-token) # Can be a primary element, as it's a unique identifier.
# Since EDM supports a maximum of two primary elements, the correct answer is 2.