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A machine learning specialist is handed a dataset of customers’ audio calls with the goal of transcribing those calls. The company has a budget for labelling those calls so as for the machine learning specialist to train on. The company has a strict policy stating that any customer related data including audio calls should not be exposed to the public. The specialist therefore needs a workforce from inside the company to work on the task of transcribing those calls. Which task labelling type should the specialist use, and which algorithm should be adopted to train on the data given that the inputs should be the audio and the outputs should be the text in this audio?