The fund invests at least 80% of its assets in bonds. For these purposes, bonds include fixed-income securities of all types. It primarily invests in a broad range of investment-grade bonds and fixed-income securities, including, but not limited to, U.S. government securities, corporate bonds, mortgage-backed and other asset-backed securities, convertible and preferred securities, senior loans and loan participations and assignments and notes. The fund may also invest in other fixed-income securities, including those of non-investment-grade quality.