Who among the following used the safety valve theory and opined that the Indian National Congress was ‘ a product of the brain of Lord Dufferin’?

The safety valve theory, which suggested that the Indian National Congress was created as a means to provide a political outlet for the Indian middle class and thus prevent more radical movements, was used by Lord Curzon. However, the specific phrase that the Indian National Congress was “a product of the brain of Lord Dufferin” is attributed to Lala Lajpat Rai, who criticized the Congress and its role in the nationalist movement.