A string is vibrating in its third harmonic. Which of the following best describes the spatial arrangement of nodes and antinodes along the string?
a) Nodes are separated by a distance 32L, and each antinode lies halfway between two successive nodes.
b) Nodes are separated by a distance 2L, and antinodes occur midway between successive nodes.
c) Nodes are separated by a distance 3L, and each antinode lies halfway between two successive nodes.
d) Nodes are separated by a distance 3L, and antinodes are located at the fixed ends of the string.