On the basis of the Keynesian model of output determination, a multiplier of 3 implies that (a) An increase in consumption by `3 will result in an increase in investment by Re. 1 (b) An increase in investment by Re. 1 will result in an increase in consumption by `3 (c) An increase in investment by Re. 1 will result in an increase in consumption by `2 (d) An increase in investment by Re. 1 will result in an increase in consumption by Re. 1