Question: In UTRAN Iub interface Node B Application Part (NBAP) signalling, when there's a contradiction between ASN.1 definition and tabular format for NBAP protocol syntax, which one takes precedence for defining conditions of conditional elements' presence?
Option 1: ASN.1 definition always takes precedence.
Option 2: Tabular format always takes precedence.
Option 3: ASN.1 definition takes precedence except for defining conditions of conditional elements, where tabular format prevails.
Option 4: It depends on the specific NBAP message type being used.
Explanation: This is because, according to guidelines for interpreting the NBAP protocol's Abstract Syntax, while ASN.1 definitions generally take precedence over tabular formats for structure and content, an exception is made for defining the presence conditions of conditional elements, where the tabular format is authoritative.