A client is admitted to the labor and delivery unit. The nurse performs a vaginal exam and determines that the client's cervix is 5 cm dilated with 75% effacement. Based on this assessment, in which phase of labor is the client? (Note: The latent/early phase is 1-3 cm dilation, the active phase is 4-7 cm dilation, and the transition phase is 8-10 cm dilation.)