In which one of the following oceans is Diamantina Trench situated?

The Diamantina feature (often referred to as the Diamantina Fracture Zone or Diamantina Deep) is associated with the Java Trench / Diamantina Fracture Zone region and has been identified as part of the Indian Ocean’s deepest areas by recent deep-sea work (Five Deeps Expedition references the Diamantina Fracture Zone and Java Trench in the Indian Ocean). Historical oceanographic data also link the vessel H.M.A.S. Diamantina’s cruise to the Java Trench and the Indian Ocean, confirming the regional association [1]. Descriptions of the Diamantina Fracture Zone place it among trenches/ridges formed between Australia and Antarctica, geographically situated in the southern Indian Ocean sector. Hence, the Diamantina Trench is in the Indian Ocean.

Sources

1. [1] https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/accession/details/7100908/3