The karyotype in klinefelter's syndrome is:

44 + XXY

The correct answer is Option (3) → 44 + XXY

Klinefelter’s Syndrome : This genetic disorder is also caused due to the presence of an additional copy of X- chromosome resulting into a karyotype of 47, 44+XXY.
Such an individual has overall masculine development,mhowever, the feminine development (development of breast, i.e., Gynaecomastia) is also expressed. Such individuals are sterile.