Solve the Zero Equation: Finding the Missing Value in 0:?=0

To solve this problem, we need to evaluate the equation $0:?=0$. When considering this equation, it implies determining what number, represented by '?', when multiplied by 0, results in 0.
According to the properties of multiplication involving zero, any number multiplied by zero results in zero. Mathematically, $a \cdot 0 = 0$ for any real number $a$.
Thus, the equation $0:?=0$ is true for all real numbers 'x' because any real number multiplied by 0 equals 0.
Given the multiple-choice options, the appropriate conclusion is option 3, which states "All answers are correct".
Therefore, this problem confirms that for the equation $0:?=0$, all real numbers satisfy the condition.

Therefore, the correct answer is All answers are correct.