Which type of address should I use?

Question

I'm still newbie of BLE developer, and designing a BLE device based on nrf51822 (whose service uuid is partially used for identification of serial number).
Like nordic's default, I'm going to use random static address for production. 
 I don't understand, the term of use of bd_addr, i.e., what kind of device should use each of: 
 
 BLE_GAP_ADDR_TYPE_PUBLIC 
 BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_NON_RESOLVABLE 
 BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE 
 BLE_GAP_ADDR_TYPE_RANDOM_STATIC 
 
 .
If I use random static, should I change the bd_addr periodically after power on? Or is that not necessary? 
 Great thanks for you help,
Takashi

David Edwin · Accepted Answer

The Nordic default is the random static address , for a random static address you do not need to change it periodically.Using a random static address does not require any management by the application.