Reagents used to convert RCHO into  RCH2OH among the following are:

(a) H2 /Pd or Pt

(b) LiAIH4

(c) NaBH4

(d) Reaction with RMgx followed by hydrolysis


1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (a, b, d)