Which of the following pairs of ions will have same spin only magnetic moment values within the pair?
• [A.] \( \text{Zn}^{2+}, \text{Ti}^{2+} \)
• [B.] \( \text{Cr}^{2+}, \text{Fe}^{2+} \)
• [C.] \( \text{Ti}^{3+}, \text{Cu}^{2+} \)
• [D.] \( \text{V}^{2+}, \text{Cu}^{+} \)
Choose the correct answer from the options given below: