In which trimester does the placenta begin absorbing nutrients and oxygen from the mother's body?

The placenta (also known as afterbirth) is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, provide thermo-regulation to the fetus, waste elimination, and gas exchange via the mother's blood supply, fight against internal infection and produce hormones to support pregnancy. The placenta provides oxygen and nutrients to growing babies and removes waste products from the baby's

In which trimester? I believe it's the second. Im pretty sure it's the second. Correct me if im wrong tho,

Ithink it would be a and b