Hormones secreted by the placenta to maintain pregnancy are:

1. A
   $\text{hCG, hPL}$, progestogens, estrogens
2. B
   $\text{hCG, hPL}$, estrogens, relaxin, oxytocin
3. C
   $\text{hCG, hPL}$, progestogens, prolactin
4. D
   $\text{hCG}$, progestogens, estrogens, glucocorticoids