Sec. $14-1$: According to experiments, the speed of light

appears to be faster than $3{10}^8\frac{m}{s}$ if you are moving toward the light source.

is the same for all observers independent of whether they or the light source are moving.

appears to be slower than $3{10}^8\frac{m}{s}$ if the light source is moving toward you.

Both $b$ and $c$