Identify the correct statemnets regarding diaphragm as contraceptive device from the given options. (i) They act as physical barrier for sperm entry. (ii) They are placed to cover the cervical region during coitus. (iii) They are introduced into the uterus to prevent implantation. (iv) They act as spermicidal agents to increase their contraceptive effectiveness.

• A. (i), (ii) only
• B. (i), (iv) only
• C. (ii), (iii), only
• D. (iii), (iv) only