The resultant of $\overrightarrow A + \overrightarrow B $ is ${\overrightarrow R _1}.$ On reversing the vector $\overrightarrow {B,} $ the resultant becomes ${\overrightarrow R _2}.$ What is the value of $R_1^2 + R_2^2$

  • A

    ${A^2} + {B^2}$

  • B

    ${A^2} - {B^2}$

  • C

    $2({A^2} + {B^2})$

  • D

    $2({A^2} - {B^2})$

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