A nursing student asks her co-assigned nurse how to assess the frequency of a laboring client's contraction pattern. What is the nurse's best response?

Timing the period from the start of uterine tightening to the relaxation of the uterus.

Timing the period between the start of one contraction and the start of the next contraction.

Timing the period from the acme phase of the contraction to the decrement phase.

Timing the period from the end of one contraction to the start of the next contraction.