Consider the Measurement Model: Y₀ = Y_T + Y_S

Consider the measurement model: Y₀ = Y_T + Y_S + Y_R. In verbal terms, the model indicates

A) a measurement (Y) at time zero (Y₀) is a function of (Y) at time T (Y_T) plus the change due to the factors Y_S and Y_R.
B) a measurement (Y₀) is a function of the true score plus systematic error.
C) a measurement (Y₀) is a function of the true score plus random error.
D) a measurement (Y₀) is a function of the true score plus systematic error plus random error.
E) a measurement always equals the true score