Pick the correct letter for:
x ≥ 5

The correct answer is:

Step 1 of 2:
Observe that, x attains the values which are greater than 5.
Now, note that only in the graphical representation of option a, x takes the values greater than 5.
Step 2 of 2:
Moreover, x also takes the value 5.
In option a, also observe that there is a closed circle around the point 5 which indicates inclusion of point 5 under the representation.
Final Answer:
The correct choice is-- a.