The correct answer is C) short-circuit protection using a fusible link AND sustained overload protection using a spring loaded soldered joint. In a dual element time delay cartridge-type fuse, the fusible link provides short-circuit protection, while the spring loaded soldered joint provides sustained overload protection. This combination of protection mechanisms is well-suited for motor applications, which can experience both sudden short-circuit faults and prolonged overload conditions. The other options are incorrect because they do not accurately describe the protection mechanisms provided by the dual element fuse. Option A incorrectly states that the spring loaded soldered joint provides short-circuit protection, while option B and D do not include the full range of protection mechanisms.