Read the following statements about cockroach :
$(a)$ In male cockroach a characteristic mushroom shaped gland is present in the $6^{th}-7^{th}$ abdominal segments which functions as an accessory reproductive gland.
$(b)$ Cockroach is uricotelic.
$(c)$ The fat body and uricose gland help in excretion.
$(d)$ Blood from sinuses enter heart through ostia and is pumped anteriorly to sinuses again.
Which of the above statements are correct?

• A
  $a, b,$ and $d$
• B
  $b$ and $c$
• C
  $a$ and $d$
• D
  $a, b, c,$ and $d$