If $A B$ is a distance between two points $A (0, a)$ and $B (0, b)$ then $A B =$ __

| a + b |

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| a - b |

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a^{2} + b^{2}

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\sqrt{a^{2} + b^{2}}

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Solution

The correct option is D $| a - b |$
$\begin{matrix} | A B | = \sqrt{{(0 - 0)}^{2} + {(a - b)}^{2}} = \sqrt{{(a - b)}^{2}} = | a - b | \end{matrix}$

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