Image. Unstable nuclei X decay independently to stable Y and Z. The graphs of lnNX versus t, NY versus t and NZ versus t are shown. Select the correct statements.

Select all that apply

• Option A

  NY: NZ is constant at all times.

• Option B

  Decay constant for X→Y is b tanθ/(b+c).

• Option C

  Decay constant for X→Z is c tanθ/(b+c).

• Option D

  NY: NZ is time-dependent.