These commands are established by combatant commanders when authorized by the secdef through the cjcs to conduct operationson a continuing basis in accordance with the criteria set forth for unified commands. they may be established on a geographic area basissuch as united states forces japan or on a functional basis such as special operations command, pacific.

a. combatant commands
b. subordinate unified commands
c. joint task forces
d. functional component commands

Option B i.e., subordinate unified commands is the correct option.

Explanation:

Because subordinate unified commands are those commands that are achieved permanent recognition by the commanders 'who engaged in fighting at the time of war' when SECDEF can approved through the CJCS to organize an operation on the ongoing basis in accord with the standard by which it set forth for the unified command.

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