Following are the amplifying systems available.(a) CB transistor amplifier(b) CC transistor amplifier(c) CE transistor amplifier(d) OP AmpSequence in terms of increasing order of voltage gain.

• A. (b), (a), (c), (d)
• B. (d), (c), (a), (b)
• C. (a), (b), (c), (d)
• D. (c), (d), (b), (a)