Protocol analyzers may present field values in either binary, decimal or hexadecimal.

A hexadecimal value is a value that uses base 16 notation, which means it can have digits from 0 to 9 and letters from A to F. A hexadecimal value is usually preceded by 0x to indicate that it is hexadecimal and not decimal or binary. For example, 0x0A is hexadecimal for 10 in decimal or 00001010 in binary. The other options are not valid prefixes for hexadecimal values.References:

CWAP-404 Study Guide, Chapter 2: Protocol Analysis, page 35

CWAP-404 Objectives, Section 2.2: Analyze field values