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${\left| {{z_1} + {z_2}} \right|^2} + {\left| {{z_1} - {z_2}} \right|^2}$ = ......

• A
  $2\left( {\left| {{z_1}} \right| + \left| {{z_2}} \right|} \right)$
• B
  $2\left( {{{\left| {{z_1}} \right|}^2} + {{\left| {{z_2}} \right|}^2}} \right)$
• C
  $\left| {{z_1}} \right|\left| {{z_2}} \right|$
• D
  ${{{\left| {{z_1}} \right|}^2} + {{\left| {{z_2}} \right|}^2}}$