Consider the variable declarations shown below.

string s $="42"$; int n $=0$;

Which of the following code snippets converts the string s to an integer n$?$ Question $12$ options:

ostringstream strm; strm$.$str$($s$)$; strm $<<$ n;

istringstream strm; strm$.$str$($s$)$; strm $>>$ n;

ostringstream strm; strm$.$str$($n$)$; str $<<$ s;

istringstream strm; strm$.$str$($n$)$; str $>>$ s;