An organization is deploying an IPv$6$ network and has been allocated the prefix $2001$:db$8/48.$ They plan to create subnets for $10$ different departments.

Each department should have the capability to further divide its subnet into smaller subnets in the future.

Which of the following subnet allocations would best suit the organization's needs for one of its departments?

$2001$:db$80010$::$/60$

$2001$:db$80100$::$/56$

$2001$:db$80$f$00$::$/52$

$2001$:db$80001$::$/64$