The Pedigree Shown Here Pertains to a Trait Due to a Rare

The pedigree shown here pertains to a trait due to a rare, X-linked recessive mutation. Individual 1 has no family history of the trait and individual 2 is affected, but the genotypes and phenotypes of individuals 1, 3, and 4 are unknown. What is the (approximate) probability that individual 1 is heterozygous? What is the probability that individual 3 is affected? What is the (approximate) probability that individual 4 is affected?

A) 1; 1; 1
B) 1; 0; 0
C) 0; 0; 1
D) 0; 1; 0
E) 0; 0; 0