When deployed at a polling booth during elections, the primary duties of security personnel like CISF are centered around maintaining peace and order within and around the booth, ensuring the safety and security of polling staff, and protecting election materials and equipment such as Electronic Voting Machines (EVMs). A) Maintaining peace at the polling booth is a core duty. B) Providing security to polling personnel is essential for the conduct of elections. C) Securing EVMs is crucial for the integrity of the election process. D) Ensuring security of the candidates is typically handled separately. While security forces ensure general law and order which benefits everyone, including candidates who might visit the booth, the specific personal security detail for candidates, especially those with high-security needs, is a different task usually assigned to dedicated security personnel or agencies, not the general duty personnel stationed at a polling booth.