The correct statements(s) about `Cr^(2+)` and `Mn^(3+)` is (are) [Atomic numbers of Cr = 24 and Mn = 25]

Options

A. `Cr^(2+)` is a reducing agent
B. `Mn^(3+)` is an oxidizing agent
C. both `Cr^(2+)` and `Mn^(3+)` exhibit `d^4` electronic configuration
D. when `Cr^(2+)` is used as a reducing agent, the chromium ion attains `d^5` electronic configuration.