A wave completes 12 oscillations in 3.0 s. The vertical distance from a crest to a trough is 8.0 mm. Which gives the period and amplitude?
4.0 s4.0\ \mathrm{s}4.0 s and 4.0 mm4.0\ \mathrm{mm}4.0 mm
0.25 s0.25\ \mathrm{s}0.25 s and 8.0 mm8.0\ \mathrm{mm}8.0 mm
0.25 s0.25\ \mathrm{s}0.25 s and 4.0 mm4.0\ \mathrm{mm}4.0 mm
4.0 s4.0\ \mathrm{s}4.0 s and 8.0 mm8.0\ \mathrm{mm}8.0 mm