Nirguna Bhakti:

• Guru Nanak's teachings primarily advocated 'nirguna bhakti,' which is devotion to the divine without attributes or qualities.
• The emphasis was on recognizing the formless nature of God, transcending gender or any specific attributes.

Rejection of Anthropomorphism:

• Guru Nanak rejected anthropomorphic representations of the divine, discouraging the worship of gods with specific forms or attributes.
• The rejection of 'saguna bhakti,' which involves devotion to a deity with specific attributes, aligns with Guru Nanak's emphasis on the formless and attributeless nature of the divine.

Oneness of God:

• Guru Nanak emphasized the oneness of God and rejected the notion of God having a specific form or gender.
• The rejection of 'saguna bhakti' is in line with the broader Sikh philosophy that recognizes the divine as formless and beyond human comprehension.

So, the correct option is [3].