; or (bb) the acquisition of an equivalent resource; or (ii) the value of a system resource, if the system resource cannot be replaced or restored; and (B) the cost of any relevant damage assessment carried out pursuant to section 204(c). (2) Response cost The term response cost means the cost of any action carried out by the Secretary— (A) to prevent, minimize, or abate destruction or loss of, or injury to, a system resource; (B) to abate or minimize the imminent risk of such destruction, loss, or injury; or (C) to monitor the ongoing effects of any incident causing such destruction, loss, or injury. (3) System resource The term system resource means any living, nonliving, historical, cultural, or archeological resource that is located within the boundaries of— (A) a unit of the National Wildlife Refuge System; (B) a unit of the National Fish Hatchery System