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Which of the following statements is true regarding the three points; $(a, a)$, $(3a, 2a)$, $(2a, 3a)$; if $a$ is a positive number?

All three points lie on the same straight line which is neither horizontal, nor vertical.

Only two of the points lie on the same line.

All three points lie on the same horizontal line.

All three points lie on the same vertical line.

Two of the points lie in the same location.