Using the Best-Subsets Approach to Model Building, Models Are Being $C _ { p } > k$

Short Answer

Using the best-subsets approach to model building, models are being considered when their a) $C _ { p } > k$
b) $C _ { p } \leq k$
c) $C _ { p } > ( k + 1 )$
d) $C _ { p } \leq ( k + 1 )$