题目如图,点AAA的坐标为(1,0)\left(1,0\right)(1,0),点BBB在直线y=−xy=-xy=−x上运动,当线段ABABAB最短时,点BBB的坐标为（ ）A.(0,0)\left(0,0\right)(0,0)B.(12(\dfrac{1}{2}(21，−12)-\dfrac{1}{2})−21)C.(22(\dfrac{\sqrt {2}}{2}(22，−22)-\dfrac{\sqrt {2}}{2})−22)D.(−12(-\dfrac{1}{2}(−21，12)\dfrac{1}{2})21)知识点：点到直线的距离章节：未标注
