A frequency modulator has a modulator gain of 10 Hz/V, and the modulating waveform is

\(m\left( t \right) = \left\{ {\begin{array}{*{20}{c}} {0,}\\ {5,}\\ {15,}\\ {7,}\\ {0,} \end{array}\;\;} \right.\begin{array}{*{20}{c}} {t < 0}\\ {0 < t < 1}\\ {1 < t < 3}\\ {3 < t < 4}\\ {4 < t} \end{array}\)

For the FM wave, the plot of instantaneous frequency deviation with respect to time t is