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Assertion (A): In a \( \triangle \mathrm{ABC}, \overrightarrow{\mathrm{AB}}+\overrightarrow{\mathrm{BC}}+\overrightarrow{\mathrm{CA}}=0 \)
Reason (R): If \( \overrightarrow{\mathrm{AB}}=\vec{a}, \overrightarrow{\mathrm{BC}}=\vec{b} \), then \( \overrightarrow{\mathrm{AC}}=\vec{a}+\vec{b} \) (Triangle law of addition).
(A) Both A and R are true and R is the correct explanation of A.br(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
(E) Both A and R are false.
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