CREATE TABLE table_53086 ("Pennant number" TEXT, "Ship" TEXT, "Builder" TEXT, "Laid down" TEXT, "Launched" TEXT, "Commissioned" TEXT)

Who is the builder of Pennant d03?
SELECT "Builder" FROM table_53086 WHERE "Pennant number" = 'd03'
SELECT "Builder" FROM "table_53086" WHERE "Pennant number" = 'd03'