With reference to the RBC, which of the following statements is/are correct?
(a)Before birth RBC are formed in liver and spleen
(b)After birth RBC are formed in bone marrow
(c)RBC has a lifetime of about 365 days
(d) Persons who live at high altitudes has more number of RBC then at plain
Select the correct answer using the code given below

A 1 and 2 only

B 1, 2 and 4 only

C 1, 2 and 3