The correct option is C 1, 2 and 4 only
The vestibular bulb, Bartholin’s gland and Skene’s gland are paired while the urethral orifice is single.
In human females- the urethral orifice is the external opening of the urethra to discharge urine outside the body. It is found in the vulval vestibule (area between the labia minora) in front of the vagina.
Vestibular bulbs are two bulbs of erectile tissues associated in the inferior side of the body of the clitoris, which are made up of corpus spongiosum tissue.
A pair of Bartholin’s glands are located on either side of the vaginal orifice, produce mucus during sexual arousal and intercourse.
A pair of mucus-secreting Skene’s glands are embedded on either side of the external urethral orifice which helps protect the epithelium of the vestibule.