Consider the following statements regarding admissions under Sections 16-19 of the Bharatiya Sakshya Adhiniyam, 2023: Statement 1: An admission made by a party's agent is valid only if the agent was expressly authorized in writing to make the admission. Statement 2: An admission is relevant and can be proved against the person who made it or their representative in interest. Statement 3: A party can prove their own admission when it consists of a statement of state of mind made at the time when such state existed and accompanied by conduct rendering its falsehood improbable. Statement 4: In civil cases, an admission made under an express condition that evidence of it shall not be given is still admissible against the admitting party. Which statements are correct?