AssertionA: If A, B, C, D are four points on a semi-circular arc...

$AssertionA:$ If $A, B, C, D$ are four points on a semi-circular arc with a centre at $O$ such that $| \overset{\to}{AB} | = | \overset{\to}{BC} | = | \overset{\to}{CD} | .$ Then, $\overset{\to}{AB} + \overset{\to}{AC} + \overset{\to}{AD} = 4\overset{\to}{AO} + \overset{\to}{OB} + \overset{\to}{OC}$

$ReasonR:$ Polygon law of vector addition yields $\overset{\to}{AB} + \overset{\to}{BC} + \overset{\to}{CD} + \overset{\to}{AD} = 2\overset{\to}{AO}$

In the light of the above statements, choose the most appropriate answer from the options given below.