The classic Spanning Tree Protocol （802.1D  1998） uses which sequence of variables to determine the best received BPDU？（）

• A、lowest root bridge id；lowest sender bridge id；lowest port id；lowest root path cost
• B、lowest root path cost；lowest root bridge id；lowest sender bridge id；lowest sender port id
• C、lowest root bridge id；lowest sender bridge id；lowest root path cost；lowest sender port id
• D、lowest root bridge id；lowest root path cost；lowest sender bridge id；lowest sender port id