Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Devanagari | ISO 15919 | UNRSGN | IAST | Comment |
| --- | --- | --- | --- | --- |
| ए /  े | ē | e | e | To distinguish between long and short 'e' in Dravidian languages, 'e' now represents ऎ /  ॆ (short). Note that the use of ē is considered optional in ISO 15919, and using e for ए (long) is acceptable for languages that do not distinguish long and short e. |
| ओ /  ो | ō | o | o | To distinguish between long and short 'o' in Dravidian languages, 'o' now represents ऒ /  ॊ (short). Note that the use of ō is considered optional in ISO 15919, and using o for ओ (long) is acceptable for languages that do not distinguish long and short o. |
| ऋ /  ृ | r̥ | ṛ | ṛ | In ISO 15919, ṛ is used to represent ड़. |
| ॠ /  ॄ | r̥̄ | ṝ | ṝ | For consistency with r̥ |
| ऌ /  ॢ | l̥ | l̤ | ḷ | In ISO 15919, ḷ is used to represent ळ. |
| ॡ /  ॣ | l̥̄ | l̤̄ | ḹ | For consistency with l̥ |
| ◌ं | ṁ | ṁ | ṃ | ISO 15919 has two options about anusvāra. (1) In the simplified nasalization option, an anusvāra is always transliterated as ṁ. (2) In the strict nasalization option, anusvāra before a class consonant is transliterated as the class nasal—ṅ before k, kh, g, gh, ṅ; ñ before c, ch, j, jh, ñ; ṇ before ṭ, ṭh, ḍ, ḍh, ṇ; n before t, th, d, dh, n; m before p, ph, b, bh, m. ṃ is sometimes used to specifically represent Gurmukhi Tippi  ੰ. |
| ◌ं | ṅ ñ ṇ n m | ṁ | ṃ | ISO 15919 has two options about anusvāra. (1) In the simplified nasalization option, an anusvāra is always transliterated as ṁ. (2) In the strict nasalization option, anusvāra before a class consonant is transliterated as the class nasal—ṅ before k, kh, g, gh, ṅ; ñ before c, ch, j, jh, ñ; ṇ before ṭ, ṭh, ḍ, ḍh, ṇ; n before t, th, d, dh, n; m before p, ph, b, bh, m. ṃ is sometimes used to specifically represent Gurmukhi Tippi  ੰ. |
| ◌ँ | m̐ |  | m̐ | Vowel nasalization is transliterated as a tilde above the transliterated vowel (over the second vowel in the case of a digraph such as aĩ, aũ), except in Sanskrit. |
Question:
how many total options are there about anusvara?
Answer:
2