Force ${\mathrm{F}}_1 \mathrm{and} {\mathrm{F}}_2$  act on a point mass in two mutually perpendicular directions. The resultant force on the point mass will be 

• A

  ${\mathrm{F}}_1+{\mathrm{F}}_2$

• B

  ${\mathrm{F}}_1-{\mathrm{F}}_2$

• C

  $\sqrt{{{\mathrm{F}}^2}_1+{{\mathrm{F}}^2}_2}$

• D

  ${{\mathrm{F}}^2}_1+{{\mathrm{F}}^2}_2$