Let's analyze the statements based on the Indian Evidence Act, 1872:
\[\begin{array}{rl} \bullet & \text{(B) is true under Section 25, which states that no confession made to a police officer shall be proved against an accused.} \\ \bullet & \text{(C) is true under the proviso to Section 26, which allows a confession made in police custody to be proved if it is made in the immediate presence of a Magistrate.} \\ \bullet & \text{(D) is true under Section 27, which allows so much of a confession (even if made to police) as relates distinctly to a fact thereby discovered to be proved.} \\ \bullet & \text{(A) is not true. Under Section 30, the confession of a co-accused can only be "taken into consideration" by the court against other co-accused. It is not substantive evidence and cannot be the sole basis for conviction. It cannot be "proved" in the same way as other evidence.} \\ \end{array}\]