Solve the Formula for the Given Letter $R _ { T } = R _ { 1 } + R _ { 2 } + R _ { 3 } + R _ { 4 } \text { for } R _ { 4 }$

Solve the formula for the given letter. $R _ { T } = R _ { 1 } + R _ { 2 } + R _ { 3 } + R _ { 4 } \text { for } R _ { 4 }$

A) $R _ { 4 } = - R _ { T } + R _ { 1 } + R _ { 2 } + R _ { 3 }$
B) $R _ { 4 } = R _ { T } + R _ { 1 } + R _ { 2 } - R _ { 3 }$
C) $R _ { 4 } = R _ { 1 } - R _ { 1 } + R _ { 2 } + R _ { 3 }$
D) $R _ { 4 } = R _ { T } + R _ { 1 } - R _ { 2 } - R _ { 3 }$
E) $R _ { 4 } = R _ { T } - R _ { 1 } - R _ { 2 } - R _ { 3 }$

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