Which if any of the following statements about types and patterns of missing data IS CORRECT?

A. Data is MCAR when the probability of a response at time t is independent of both the previously observed values and the unobserved values at time t.

B. Data is MAR when the probability of response at time t depends on the previously observed values but not the unobserved values at time t.

C. Data is NMAR when the probability of response at time t depends on the unobserved values at time t.

D. Intermittent missingness is when a patient drops out of the study or dies, their data from a certain point onwards will be unobserved.

E. Monotone missingness is defined to be when an outcome is unobserved at one assessment but is observed at a following assessment.