The correct answer to this question is option 4: a system of tribunals and a ban on strikes.

The Trade Disputes Act of 1929 was a piece of legislation passed by the British Parliament in response to a wave of strikes and industrial unrest in the 1920s. The purpose of the Act was to provide a framework for the resolution of trade disputes and to prevent further disruption to the economy.

One of the main features of the Act was the establishment of a system of tribunals to hear and resolve disputes between employers and employees. These tribunals were given the power to make binding decisions and to impose penalties on either party for non-compliance. This system of tribunals was intended to provide a fair and impartial forum for the resolution of disputes, and to avoid the need for strikes and other forms of industrial action.

Another key provision of the Act was the ban on strikes by certain categories of workers. Under the Act, workers employed in industries considered to be essential to the national interest, such as transportation and energy, were prohibited from going on strike. The aim of this provision was to ensure that vital services were not disrupted by industrial action and to protect the national economy.

It is important to note that the Trade Disputes Act of 1929 did not give arbitrary powers to management to quell industrial disputes. Instead, it sought to establish a framework for resolving disputes that was fair and impartial, and that did not give undue advantage to either party.

In conclusion, the Trade Disputes Act of 1929 provided for a system of tribunals and a ban on strikes in certain industries. These provisions were intended to prevent further disruption to the economy and to provide a fair and impartial forum for the resolution of disputes.