Correct statements among a to $d$ regarding silicones are :
(a) They are polymers with hydrophobic character
(b) They are biocompatible.
(c) In general, they have high thermal stability and low dielectric strenth.
(d) Usually, they are resistant to oxidation and used as greases.
(a), (b) and (c) only
(a), and (b) only
(a), (b), (c) and (d)
(a), (b) and (d) only
Correct Option: , 3