【单选题】【消耗次数：1】
求3-正则的彼得森（Petersen）图的边覆盖数a1 =
①
3；
②
4；
③
5；
④
6。
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关于完全图 Kn (n 3 3)的点独立数b0、点覆盖数a0、匹配数b1与边覆盖数a1，下面的哪些性质正确：
①
b1 a0；
②
b1 a0；
③
b0 a1；
④
b1 ≤ a1。
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