(a) Perfection by control. A security interest in investment property, deposit accounts, letter-of-credit rights, electronic chattel paper, or electronic documents may be perfected by control of the collateral under section 7-106, 9-104, 9-105, 9-106 or 9-107.
(b) Specified collateral: Time of perfection by control; continuation of perfection. A security interest in deposit accounts, electronic chattel paper, letter-of-credit rights, or electronic documents is perfected by control under section 7-106, 9-104, 9-105 or 9-107 when the secured party obtains control and remains perfected by control only while the secured party retains control.
(c) Investment property: Time of perfection by control; continuation of perfection. A security interest in investment property is perfected by control under section 9-106 from the time the secured party obtains control and remains perfected by control until:
(1) The secured party does not have control; and