A:
From the HP Website
Media sizes supported
A4 (210 x 297 mm)
A6 (105 x 148 mm)
B5 (176 x 250 mm)
DL envelope (110 x 220 mm)
Media types
Paper (brochure, inkjet, plain), photo paper, envelopes, labels, cards (greeting)
Media weight, supported
Tray 1: A4: 60 to 90 g/m²
HP envelopes: 75 to 90 g/m²
HP cards: up to 200 g/m²
HP 10 x 15 cm photo paper: up to 300 g/m²
Media weight, recommended
75 g/m²