Consider the following statement (s) related to the force of friction I.It is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. II.When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). Which is/are correct statement (s)?

• A. Only I
• B. Only II
• C. Both I & II
• D. Neither I nor II