English for Specific Purposes (ESP) or Instrumental English focuses on the development of reading skills through the identification of cognates and discursive markers. Analyze the following statements regarding the methodology of ESP for academic researchers:

I. The focus of ESP is primarily on developing a deep understanding of the target professional field's lexicon and genre conventions.
II. In an instrumental approach, the learner is encouraged to use background knowledge to facilitate the top-down processing of the text.
III. Grammar is taught as an end in itself, requiring students to master all irregular verbs before attempting to read any specialized article.

Which of the following are CORRECT: