Which is the best scheme to invest for three years?

I am planning to invest Rs 50,000 via SIPs in a short-term debt fund. These are the schemes I found:
Franklin India Low Duration Fund
Aditya Birla Sun Life Savings Fund
L&T Short Term Income Fund
Aditya Birla Sun Life Corporate Bond Fund
Could you please suggest which scheme is good for an investment of three years. I am investing in debt fund because I don't want to lose money. I need to make Rs 20 lakh after 3 years. Otherwise, I will go for RDs. I don't want lose any money.
-- Nutan

Deepali Sen, Founder, Srujan Financial Advisers, responds:

These schemes are good. The tenure is also right. An investment of Rs 50,000 per month at a compounded annual rate of 8 per cent may help you to build a corpus of Rs 20 lakh after three years. So you can go ahead with this investment.

Medium-term debt funds make more sense over RDs. They will give higher pre-tax returns. With triple indexation benefit, the long-term gains are taxed at 20 per cent. However, the tax treatment on the units will be on a FIFO (first in first out) basis.