Answer: The fourth option. [tex]AB^{<-->}[/tex]
Step-by-step explanation:
BA stands for the segment between B and A, so this is not the correct option.
B (with a double arrow on top) refers to a line, but with only one point we could draw infinite lines, so this is not the correct option)
mB (with a double arrow on top) does not mean anything.
AB (with a double arrow on top) refers to a line that phases through the points A and B, so this is the other way of naming the line m.
