A rise in ‘SENSEX’ means

(a)

a rise in prices of shares of all companies registered with Bombay Stock Exchange

(b)

a rise in prices of shares of all companies registered with National Stock Exchange

(c)

an overall rise in prices of shares of group of companies registered with Bombay Stock Exchange

(d)

a rise in prices of shares of all companies belonging to a group of companies registered with Bombay Stock Exchange