OSPF area defintion with interfaces

I have see this on some LAB examples. It looks like this:

interface serial0

ip add

router ospf 1

And then there are two possible solutions for the wildcard mask within the network definition.

1. network area 0

and i have also seen this:

2. network area 0
So both area definitions are possbile. Not that with the secound example, it’s not necessary to calculate a wildcard mask for OSPF.But for some reason i don’t feel like using it. But on the other side, this make sure you don’t misconfigure the OSPF network wildcard mask.

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