What is the grammatical effect of lā in lā aʿbudu?

Supplementary Practice 22: Comparative Rhetorical Study of Sūrat al-Kāfirūn and al-Naṣr

• It is lā of negation; aʿbudu remains indicative
• It is prohibitive lā and makes aʿbud jussive
• It is lā of categorical negation and aʿbud is its noun
• It is a coordinating lā making the verb subjunctive