Explanation:

Let’s break it down:

- Option 1: Shaivite form of worship

This is about devotion to Shiva. It doesn’t automatically mean Nirguna; Shaivism often includes both Saguna (with attributes) and Nirguna (without attributes) forms.

- Option 2: Vaishnavite form of worship

This is about adoring Vishnu. Like above, Vaishnavism also covers both Saguna and Nirguna traditions.

- Option 3: Incarnation worship

Incarnation (avatar) worship means focusing on God appearing in human or other forms. This is a Saguna approach, as it gives God explicit qualities.

- Option 4: Abstract form of God worship

Here’s the thing: Nirguna Bhakti is all about connecting with God as formless, beyond human-like attributes—pure spirit or absolute essence. No images, no shape, no avatars.

So yes, option 4 is the accurate one. Nirguna Bhakti means worship of God in an abstract, formless way—no names, no forms.