Which of the following statement are true about endocrine glands?(i) They are ductless glands.(ii) They secrete h ormones directly into the blood(iii) Examples are mammary glands and salivary glands.

• A. Only (i) and (ii)
• B. Only (i) and (iii)
• C. Spongilla has special collared cells called choanocytes, not found in the remaining three.
• D. All the three