Answer:
Choice A is correct. This is because of the fact that the domain means the x-values of a function. The x-values given here are 3, 6, -1, 5, & -4. When you rearrange these in ascending order, you will get -4, -1, 3, 5, & 6. The meaning of the symbol "|" is "such that". When you put our domain in set notation, we will get x = -4,-1,3,5,6, which means "x such that x is equal to -4, -1, 3, 5, and 6". Hope this helped :)