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Difference between Network ID and Subnet ID?

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Difference between Network ID and Subnet ID?

JarrydRSA
Hi there, I'm busy studying for my CCNET and CCNA and after learning how to subnet etc I did some test questionaires. I came across this question and I don't know what the difference or how to tell the difference in the context of this question, any help would be greatly appreciated:

1.which of the following statements would best describe the following IP address and subnet mask 192.92.92.56 255.255.255.240
a. the correct network ID is 192.92.92.0 and broadcast address is 192.92.92.255
b. 192.92.92.48 is the correct network ID and broadcast address is 192.92.92.63
c. the correct subnet ID is 192.92.92.48 and broadcast address is 192.92.92.63
192.92.92.48 is the correct network ID and the broadcast address is 192.92.92.255

Now I chose C after my calculations of working out in binary but the site says the correct answer is B, now I did try google the difference and some people say there is no difference so am I missing something or does this question then have 2 possible answers. (I also might be and idiot and misunderstood something long the way of my studying).