What is the deepest zone of the ocean known as?

Here is the question :

WHAT IS THE DEEPEST ZONE OF THE OCEAN KNOWN AS?

Here is the option for the question :

Black abyss zone
Hadalpelagic zone
Sea floor zone
Abyssopelagic zone

The Answer:

And, the answer for the the question is :

Hadalpelagic zone

Explanation:

[STC0019036]. The hadalpelagic zone, also known as the hadal zone, is the deepest region of the ocean and encompasses an area less than 6,000 meters deep. The hadal zone contains ocean trenches such as the Mariana Trench in the Pacific Ocean, which is the world’s deepest marine ecosystem. The name is derived from Greek mythology, as Hades is the Greek deity of the underworld. For many years, scientists assumed that the enormous pressures present in the hadal zone meant that nothing could survive there, but recent discoveries indicate that it may be alive and well. However, due to the difficulty of researching at such vast depths, scientists currently know relatively little about the hadal zone.