Which of the following features are correct? Choose correct option. a. The thyroid gland is the only endocrine gland in the human body which stores its hormones. b. Deficiency of iodine in our diet results in hypothyroidism and enlargement of the thyroid gland, commonly called goitre. c. Hypothyroidism during pregnancy causes defective development and maturation of the growing baby leading to cretinism. d. Hyperthyroidism is caused by cancer of the thyroid gland or due to development of nodules of the thyroid glands.