Alarm clock 1 is positioned at \(x=-d\) and alarm clock 2 at \(x=+d\) in reference frame \(\mathrm{A}\). According to a clock in reference frame \(\mathrm{A}\), both go off at \(t=0\). An observer in reference frame \(B\), which is moving relative to \(A\), measures alarm clock 2 as going off first. In what direction is \(B\) moving relative to \(A\) ?