Sant bhasha refers to the language of the nirguna mystics. Option 1 is the correct answer.

Nirguna mystics are those who believe in the formless nature of God. They do not attribute any physical or material qualities to God and consider God to be beyond human comprehension. Sant bhasha, also known as the language of the saints, is the language used by these mystics to express their spiritual experiences, devotion, and teachings.

Option 2, ulatbansi mystics, does not align with the concept of Sant bhasha. Ulatbansi is a folk poetic style, characterized by the reverse order of words or syllables, often used in the Braj region of India. This option is unrelated to the question.

Option 3, nirakar mystics, refers to those who believe in the formlessness of God, similar to the nirguna mystics mentioned in option 1. However, Sant bhasha is specifically associated with the nirguna mystics and not the nirakar mystics.

Option 4, saguna mystics, refers to those who believe in the presence of attributes or qualities in God. This goes against the concept of Sant bhasha, which is used by