The Jalali Calendar was founded by:

The Jalali Calendar is a highly accurate solar calendar, primarily used in Iran and Afghanistan, known for its precision in determining the start of the new year (Nowruz).

The calendar was founded and reformed by a group of astronomers and mathematicians under the patronage of Sultan Malik-Shah I. The principal architect of this reform was the renowned Persian polymath Omar Khayyam. His contributions to mathematics and astronomy were instrumental in developing this sophisticated calendar system in the 11th century.

• Ibn Al-Haitham was a prominent Arab polymath known for his work in optics and scientific methodology, not the Jalali Calendar.
• The name 'Jalali' refers to Sultan Jalal ad-Dawlah Malik-Shah I, who commissioned the calendar, not an individual named Jalal ud Din who founded it.
• Therefore, 'None of these' is incorrect as Omar Khayyam was indeed the founder.