A.
is the domain of function.
Explanation:
We know that , the domain of definition of a function is the set of "input" or argument values for which the function is defined. The function provides an "output" or value for each member of the domain. Conversely, the set of values the function takes on as output is termed the image of the function, which is sometimes also referred to as the range of the function. Basically , if Y = function of x then, all values of x is domain and all values of y is range !.
In the above question , with the help of graph its clear that value of x can't be less than -2. ∴
is the domain of function.