P integral thresholds

1. A.There exists $\lambda$ such that $I_{\lambda }$ converges, but $K_{\lambda }$ does not converge.✓
2. B.There exists $\lambda$ such that $K_{\lambda }$ converges, but $I_{\lambda }$ does not converge.✓
3. C.There exists $\lambda$ such that $I_{\lambda },K_{\lambda }$ both converge.
4. D.There exists $\lambda$ such that neither $I_{\lambda }$ nor $K_{\lambda }$ converges.✓

The trap it tests

Boundary and endpoint

The statement turns at the edge of the interval, the domain, or the parameter range.