Find the lateral area of the regular prism with height h, if the base of the prism is: regular hexagon with the side 3.5 cm and h = 4 cm

For this case we have that the lateral area of the prism is given by the following expression:
 A = (6) * (L) * (h)
 Where,
 L: hexagon side
 h: prism height
 Substituting the values we have:
 A = (6) * (3.5) * (4)
 A = 84 cm ^ 2
 
 The lateral area of the regular prism is:
 A = 84 cm ^ 2

Ithink the answer is c