Explanation:

First is correct. It extended the principle of communal representation by providing separate electorates for Sikhs, Indian Christians, Anglo-Indians and Europeans.
Second is correct. It separated, for the first time, provincial budgets from the Central budget and authorized the provincial legislatures to enact their budgets.
Third is correct. It introduced, for the first time, bicameralism and direct elections in the country. Thus, the Indian Legislative Council was replaced by a bicameral legislature consisting of an Upper House (Council of State) and a Lower House (Legislative Assembly). The majority of members of both the Houses were chosen by direct election.

All of the above is correct.
Other features of Government of India Act of 1919 are given below-
1. It relaxed the central control over the provinces by demarcating and separating the central and provincial subjects. The central and provincial legislatures were authorised to make laws on their respective list of subjects. However, the structure of government continued to be centralised and unitary.
2. It further divided the provincial subjects into two parts—transferred and reserved. The transferred subjects were to be administered by the governor with the aid of ministers responsible to the legislative Council.
The reserved subjects, on the other hand, were to be administered by the governor and his executive council without being responsible to the legislative Council. This dual scheme of governance was known as ‘dyarchy’—a term derived from the Greek word di-arche which means double rule. However, this experiment was largely unsuccessful.
3. It required that the three of the six members of the Viceroy’s executive Council (other than the commander-in-chief) were to be Indian.
4. It granted franchise to a limited number of people on the basis of property, tax or education.
5. It created a new office of the High Commissioner for India in London and transferred to him some of the functions hitherto performed by the Secretary of State for India.
6. It provided for the establishment of a public service commission. Hence, a Central Public Service Commission was set up in 1926 for recruiting civil servants.
7. It provided for the appointment of a statutory commission to inquire into and report on its working after ten years of its coming into force.