Oral contraceptives inhibits …$A$… and implantation as the well as quality of cervical …$B$… to prevent the entry of sperms. Choose the correct option for $A$ and $B$ to complete the given statement 

Which of the following is a mechanical barrier used in birth control:

Diaphragms are contraceptive devices used by the females. Choose the correct option from the statements given below: $i$. They are introduced into the uterus $ii$. They are placed to cover the cervical region $iii$. They act as physical barriers for sperm entry $iv$. They act as spermicidal agents

Saheli – the new oral contraceptive for the females contains a …………