Using the preliminary factoring strategy, which method applies to p^2 + 5p + pq + 5q?

1. The expression p squared plus 5p plus pq plus 5q has four separate terms and no factor shared by all of them. 2. Since it is not a binomial or trinomial, the grouping method applies: it has more than three terms. 3. Undo FOIL only applies to trinomials, a GCF step requires a shared factor across all terms, and the difference of squares pattern needs a two-term binomial, so none of those fit here. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 7 "Factoring", section 7.3 Factor Quadratic Trinomials with Leading Coefficient Other than 1_