单选题A network administrator provides an IP address of 128.135.0.142 and a subnet mask of 255.0.0.0. Once a ping is attempted， it fails. Which of the following options is the most probable cause of the failed ping？（）A0 is not valid in an IP addressB128 is a reserved networkCThe subnet mask should be 255.255.0.0. since it is a class BDA network problem has occurred since IP and subnet are valid
单选题
A network administrator provides an IP address of 128.135.0.142 and a subnet mask of 255.0.0.0. Once a ping is attempted， it fails. Which of the following options is the most probable cause of the failed ping？（）
A
0 is not valid in an IP address
B
128 is a reserved network
C
The subnet mask should be 255.255.0.0. since it is a class B
D
A network problem has occurred since IP and subnet are valid
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