A small marble is attached to a thread that has a negligible mass. When the marble is pulled back a small distance and released, it swings in simple harmonic motion with a frequency of $0\mathrm{.}60$ Hz $.$ What is the frequency of the pendulum if the length of the thread is increased by a factor of $4?$

$0\mathrm{.}3$ Hz

$2\mathrm{.}4$ Hz

$1\mathrm{.}2$ Hz

$0\mathrm{.}15$ Hz