Range of a function is all possible value of the dependent variable ( y-values) after which the domain (x-values ) have been substituted
For function f(x) = x + 3, the range would have been the set of all real numbers, but there is condition given which is x is not equal to 1 (x ≠ 1)
If x = 1, y will be
Hence, the range of the function f(x) will be
The second option is the correct answer