Final answer:
Basic RNAV is synonymous with Area Navigation (RNAV), allowing for flexible flight paths as opposed to being confined to direct routes between navigation aids.
Step-by-step explanation:
Basic RNAV (BRNAV) is synonymous with Option 2: Area Navigation (RNAV). BRNAV is a standard that allows aircraft to fly on any desired flight path within the coverage of ground- or space-based navigation aids, within the limits of the capability of the self-contained systems, or a combination of both. It does not refer to Required Navigation Performance (RNP), Precision Approach Path Indicator (PAPI), or Minimum Navigation Performance Specifications (MNPS), which are different navigation concepts.