The question pertains to the characteristics and recommended actions after an elapid snakebite. Let's analyze each statement:

1. Statement 1: Regardless of the anatomic site of bite, walking of the victim should be discouraged. 
   When an elapid snake bites, its venom is neurotoxic, meaning it can affect the nervous system, potentially leading to paralysis and other severe symptoms. Avoiding movement, particularly walking, is recommended to slow the spread of venom throughout the body. Thus, statement 1 is correct.
2. Statement 2: Pressure immobilization should be used, wherever possible. 
   Pressure immobilization is a first aid measure used to slow the systemic spread of venom in the event of a snakebite, especially with neurotoxic venom such as that from elapids (cobras, kraits, etc.). The technique involves applying a pressure bandage and keeping the affected limb still. Statement 2 is therefore correct.
3. Statement 3: Ptosis can be present after the elapid bite. 
   Ptosis, which is the drooping of the upper eyelid, is a common neurological symptom associated with neurotoxic envenomation from elapid bites. It indicates the involvement of muscles controlled by the neurological pathways impaired by the venom. Hence, statement 3 is correct.

Considering the explanations above, all the statements given in the question are correct. Therefore, the correct answer is:

1, 2 and 3

It's important for students preparing for exams like SSC, Banking, UPSC, and others to understand the physiological effects of snake venoms and the appropriate first aid measures. Key points include limiting the victim's movement and using pressure immobilization techniques to manage elapid snakebites effectively.