How do you expect the metallic hydrides to be useful for hydrogen storage?

Options

1. AMetallic hydrides are not useful for hydrogen storage.
2. BMetallic hydrides can chemically absorb and release hydrogen, providing a safe and efficient means of storage.
3. CMetallic hydrides are primarily used for hydrogen production, not storage.
4. DMetallic hydrides are only useful for storing small amounts of hydrogen.