To solve this problem, we need to understand the life cycles of Ectocarpus and Fucus.$\newline$Let's analyze each organism:$\newline \bullet$Ectocarpus:$\newline$ - Ectocarpus is a brown alga that exhibits a haplodiplontic life cycle.$\newline$ - In this type of life cycle, both the haploid and diploid stages are multicellular and free-living.$\newline$ - The organism alternates between a multicellular haploid gametophyte and a multicellular diploid sporophyte.$\newline \bullet$Fucus:$\newline$ - Fucus is another brown alga, but it exhibits a diplontic life cycle.$\newline$ - In a diplontic life cycle, the diploid stage is the dominant, multicellular phase.$\newline$ - The haploid stage is reduced to gametes, which are not free-living.$\newline$Now, let's match the life cycles with the correct options:$\newline$Ectocarpus has a haplodiplontic life cycle, and Fucus has a diplontic life cycle.$\newline$Therefore, the correct answer is Option 2: Haplodiplontic, Diplontic.