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