Jimmy’s age is one year less than the sum of the ages of his siblings Serena and Tyler. Which equation represents Jimmy’s age?

Alook at the picturex represents Tyler’s age, y represents Serena’s age, and z represents Jimmy’s age

Blook at the picturex represents Jimmy’s age, y represents Tyler’s age, and z represents Serena’s age

Clook at the picturex represents Serena’s age, y represents Jimmy’s age, and z represents Tyler’s age

Dlook at the picturex represents Jimmy’s age, y represents Serena’s age, and z represents Tyler’s age