Which of the following is an allowable rent increase under the Residential Tenancy Act? (Assume $50 is the maximum allowable increase according to the Consumer Price Index).

1. (1)On July 1, Linus law fully raises Lucy's rent from $1,000 to $1,050 per month. Five months later, Lucy moves out and Linus rents to Charlie for $1,050. Two months later, Linus gives notice to Charlie of another $50 per month increase. Charlie objects to the increase.
2. (2)Linus raises Lucy's rent by $50 per month; seven months later, he loses his job and gives Lucy three months' written notice of a further $50 per month increase. Lucy objects to the increase.
3. (3)On July 1, Linus raises Lucy's rent from $1,000 to $1,050 per month. Two months later, Lucy is transferred to Campbell River and Linus re-rents to Charlie, but at a monthly rate of $1,200. Charlie knows Lucy only paid $1,050 and objects to the increase.
4. (4)Lucy has been paying $1,000 per month for the last three months, prior to which she paid $950.Her landlord, Linus has sold the premises to Charlie, who immediately gives Lucy notice of a rent increase to $1,050 per month effective in two months. Lucy objects to the increase.