Trong không gian Oxyz, cho ba vectơ a=(x1;y1;z1), b=(x2;y2;z2), c=(x3;y3;z3)

A. $\left(\overrightarrow{\mathrm{a}}.\overrightarrow{\mathrm{b}}\right).\overrightarrow{\mathrm{c}}=\left(\overrightarrow{\mathrm{b}}.\overrightarrow{\mathrm{c}}\right).\overrightarrow{\mathrm{a}} \mathrm{với} \mathrm{mọi} \overrightarrow{\mathrm{a}}, \overrightarrow{\mathrm{b}}, \overrightarrow{\mathrm{c}}$

B. $\left(\overrightarrow{\mathrm{a}}.\overrightarrow{\mathrm{b}}\right).\overrightarrow{\mathrm{c}}=\left(\overrightarrow{\mathrm{b}}.\overrightarrow{\mathrm{c}}\right).\overrightarrow{\mathrm{a}} \iff \overrightarrow{\mathrm{b}}=\overrightarrow{0}$

C. $\left(\overrightarrow{\mathrm{a}}.\overrightarrow{\mathrm{b}}\right).\overrightarrow{\mathrm{c}}=\left(\overrightarrow{\mathrm{b}}.\overrightarrow{\mathrm{c}}\right).\overrightarrow{\mathrm{a}} \iff \overrightarrow{\mathrm{a}}//\overrightarrow{\mathrm{c}}$

D. $\left|\left(\overrightarrow{\mathrm{a}}.\overrightarrow{\mathrm{b}}\right).\overrightarrow{\mathrm{c}}\right|\le \left|\overrightarrow{\mathrm{a}}\right|.\left|\overrightarrow{\mathrm{b}}\right|.\left|\overrightarrow{\mathrm{c}}\right|$