A 22-year-old female with history of migraine is presented with 2 days history of constant pressure like headache with associated photophobia and temperature of 38, Her cerebrospinal Maid was clear, and analysis showed protein of S2mg/di (23-38mg/di), placose 76mg/di, and 26 mononucicar cells mm3 (up to 5). Which of the following is the most likely diagnosis?