Analyze the relationship between 'HDFC' and 'HDFC Bank' within the context of the input sentence.
Options: chairperson, stock exchange, original broadcaster, operator

Major gainers were Hindunilver (4.24per cent), Bharti Artl (4.12per cent), Axis Bank (3.59per cent), Lupin (3.45per cent), BHEL (3.01per cent), ITC (2.26per cent), HDFC (2.15per cent), Cipla (1.98 per cent), Bajaj Auto (1.81 per cent), Coal India (1.60 per cent), Dr Reddys (1.67 per cent), L&T (1.56 per cent), Heromotoco (1.20 per cent), HDFC Bank (1.06 per cent), SBI (1.43 per cent), Reliance (0.72 per cent), M&M (0.98 per cent) and NT per cent (0.87 per cent).
operator