Alport syndrome is autosomal recessive, Jacob syndrome occur due to extra Y chromosome in males, i.e, XYY karyotype. Down's syndrome is also autosomal disorder due to extra copy of 21 chromosome.
The answer is SCID[severe combined immunodeficiency], it is an X linked disorder. So, Option d is correct.

Heritable Disorders of X Chromosome

Heritable disorders of X chromosome are genetic conditions that are inherited through the X chromosome. The X chromosome is one of the two sex chromosomes in humans, and it carries many genes that code for various traits and functions in the body. Some of the most common heritable disorders of X chromosome include:

1. Alport Syndrome
Alport syndrome is a genetic disorder that affects the kidneys, ears, and eyes. It is caused by mutations in the COL4A3, COL4A4, or COL4A5 genes, which are located on the X chromosome. The condition is characterized by progressive kidney disease, hearing loss, and eye abnormalities.

2. Jacob Syndrome
Jacob syndrome, also known as XYY syndrome, is a genetic disorder in which males have an extra Y chromosome. The condition is caused by a random error in cell division during the formation of sperm or egg cells. Jacob syndrome is often associated with tall stature and learning disabilities, but many affected individuals have no noticeable symptoms.

3. Down Syndrome
Down syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21. However, in some cases, Down syndrome can also be caused by a partial or full extra copy of the X chromosome. The condition is characterized by intellectual disability, developmental delays, and physical abnormalities.

4. SCID Syndrome
SCID syndrome, or severe combined immunodeficiency syndrome, is a genetic disorder that affects the immune system. The condition is caused by mutations in several genes, including those located on the X chromosome. Individuals with SCID syndrome have a weakened or absent immune system, which makes them vulnerable to infections and illnesses.

Conclusion
Heritable disorders of X chromosome are genetic conditions that are caused by mutations in genes located on the X chromosome. These conditions can affect various functions and systems in the body, including the kidneys, ears, eyes, immune system, and intellectual ability. Some of the most common heritable disorders of X chromosome include Alport syndrome, Jacob syndrome, Down syndrome, and SCID syndrome.