d
\(\hat i\,.\left( {\hat j\,\, \times \hat k} \right)+ \;\,\hat j\,\,.\,\,\left( {\hat k\,\, \times \,\,\hat i} \right)\,\, + \,\,\hat k\,\,.\,\,\left( {\hat i\,\, \times \,\,\hat j} \right)\,\, = \,\,\hat i\,\,.\,\,\hat i + \;\,\hat j\,\,.\hat j + \hat k\,\,.\,\,\hat k\,\, = \,\,1\,\, + \;\,1\,\, + \;\,1\,\, = \,\,3\)