Can someone help? X:Ω→R is a random variable, if (a multiple choice question -- please mark all answers that apply) a. \

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Can someone help?
X:Ω→R is a random variable, if (a multiple choice question -- please mark all answers that apply)
a.
\(X\) is measurable, i.e. the preimage of any set \((-\infty, a]\) is a subset of the \(\sigma\)-algebra of subsets of \(\Omega\)
b.
\(X\) is bounded
c.
\(X\) takes on integer values
d.
\(X\) is a sum of two random variables