About Question enthuware.ocpjp.v11.2.3416 :

[marcioggs]

According to the comment on option 4, can we assume that both (2 and 3) or (3 and 4) are correct?

Although it would be good to close an open file as soon as its use is over, but if the total number of open files is limited using option 2, the given code is fine.

[admin]

No, 3 + 4 is not correct because as the comment to option 4 says, it is good to do but not helpful here.

[marcioggs]

So maybe it would be better to rephrase the comment since it's not helpful regardless of if option 2 is chosen.

[admin]

Yes, that's what the comment to option 4 says, "Although it would be good to close an open file as soon as its use is over, but if the total number of open files is limited using option 2, the given code is fine." This clearly implies that 4 is not useful.
Also, you asked about (2 and 3) or (3 and 4). Not 2 + 4.

2+4 is not correct because you need 2 as well as 3.

[61d14837]

How do you
make sure that the number of lines in the file referred to by listOfFilesFile at //2 is within acceptable limit
without opening it?

[admin]

There could be several ways depending on OS, depending on the environment in which the program is running, depending on the resources available. May be it is a configurable limit and the program should compare with that limit.